File size: 164,570 Bytes
6fa4bc9
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
{
    "paper_id": "2021",
    "header": {
        "generated_with": "S2ORC 1.0.0",
        "date_generated": "2023-01-19T13:27:28.909240Z"
    },
    "title": "Capturing document context inside sentence-level neural machine translation models with self-training",
    "authors": [
        {
            "first": "Elman",
            "middle": [],
            "last": "Mansimov",
            "suffix": "",
            "affiliation": {
                "laboratory": "",
                "institution": "New York University",
                "location": {}
            },
            "email": "mansimov@cs.nyu.edu"
        },
        {
            "first": "G\u00e1bor",
            "middle": [],
            "last": "Melis",
            "suffix": "",
            "affiliation": {
                "laboratory": "",
                "institution": "New York University",
                "location": {}
            },
            "email": "melisgl@google.com"
        },
        {
            "first": "Lei",
            "middle": [],
            "last": "Yu",
            "suffix": "",
            "affiliation": {
                "laboratory": "",
                "institution": "New York University",
                "location": {}
            },
            "email": "leiyu@google.com"
        }
    ],
    "year": "",
    "venue": null,
    "identifiers": {},
    "abstract": "Neural machine translation (NMT) has arguably achieved human level parity when trained and evaluated at the sentence-level. Document-level neural machine translation has received less attention and lags behind its sentence-level counterpart. The majority of the proposed document-level approaches investigate ways of conditioning the model on several source or target sentences to capture document context. These approaches require training a specialized NMT model from scratch on parallel document-level corpora. We propose an approach that doesn't require training a specialized model on parallel document-level corpora and is applied to a trained sentence-level NMT model at decoding time. We process the document from left to right multiple times and self-train the sentence-level model on pairs of source sentences and generated translations. Our approach reinforces the choices made by the model, thus making it more likely that the same choices will be made in other sentences in the document. We evaluate our approach on three document-level datasets: NIST Chinese-English, WMT19 Chinese-English and Open-Subtitles English-Russian. We demonstrate that our approach has higher BLEU score and higher human preference than the baseline. Qualitative analysis of our approach shows that choices made by model are consistent across the document.",
    "pdf_parse": {
        "paper_id": "2021",
        "_pdf_hash": "",
        "abstract": [
            {
                "text": "Neural machine translation (NMT) has arguably achieved human level parity when trained and evaluated at the sentence-level. Document-level neural machine translation has received less attention and lags behind its sentence-level counterpart. The majority of the proposed document-level approaches investigate ways of conditioning the model on several source or target sentences to capture document context. These approaches require training a specialized NMT model from scratch on parallel document-level corpora. We propose an approach that doesn't require training a specialized model on parallel document-level corpora and is applied to a trained sentence-level NMT model at decoding time. We process the document from left to right multiple times and self-train the sentence-level model on pairs of source sentences and generated translations. Our approach reinforces the choices made by the model, thus making it more likely that the same choices will be made in other sentences in the document. We evaluate our approach on three document-level datasets: NIST Chinese-English, WMT19 Chinese-English and Open-Subtitles English-Russian. We demonstrate that our approach has higher BLEU score and higher human preference than the baseline. Qualitative analysis of our approach shows that choices made by model are consistent across the document.",
                "cite_spans": [],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Abstract",
                "sec_num": null
            }
        ],
        "body_text": [
            {
                "text": "Neural machine translation (NMT) Kalchbrenner and Blunsom, 2013; Bahdanau et al., 2014) has achieved great success, arguably reaching the levels of human parity (Hassan et al., 2018) on Chinese to English news translation that led to its popularity and adoption in academia and industry. These models are predominantly trained and evaluated on sentence-level parallel corpora. Document-level machine translation that requires capturing the context to accurately translate sentences has been recently gaining more popularity and was selected as one of the main tasks in the premier machine translation conference WMT19 (Barrault et al., 2019) and WMT20 (Barrault et al., 2020) .",
                "cite_spans": [
                    {
                        "start": 33,
                        "end": 64,
                        "text": "Kalchbrenner and Blunsom, 2013;",
                        "ref_id": "BIBREF25"
                    },
                    {
                        "start": 65,
                        "end": 87,
                        "text": "Bahdanau et al., 2014)",
                        "ref_id": "BIBREF5"
                    },
                    {
                        "start": 161,
                        "end": 182,
                        "text": "(Hassan et al., 2018)",
                        "ref_id": "BIBREF18"
                    },
                    {
                        "start": 618,
                        "end": 641,
                        "text": "(Barrault et al., 2019)",
                        "ref_id": null
                    },
                    {
                        "start": 652,
                        "end": 675,
                        "text": "(Barrault et al., 2020)",
                        "ref_id": null
                    }
                ],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Introduction",
                "sec_num": "1"
            },
            {
                "text": "A straightforward solution to translate documents by translating sentences in isolation leads to inconsistent but syntactically valid text. The inconsistency is the result of the model not being able to resolve ambiguity with consistent choices across the document. For example, the recent NMT system that achieved human parity (Hassan et al., 2018) inconsistently used three different names \"Twitter Move Car\", \"WeChat mobile\", \"WeChat move\" when referring to the same entity (Sennrich, 2018) .",
                "cite_spans": [
                    {
                        "start": 328,
                        "end": 349,
                        "text": "(Hassan et al., 2018)",
                        "ref_id": "BIBREF18"
                    },
                    {
                        "start": 477,
                        "end": 493,
                        "text": "(Sennrich, 2018)",
                        "ref_id": "BIBREF41"
                    }
                ],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Introduction",
                "sec_num": "1"
            },
            {
                "text": "To tackle this issue, the majority of the previous approaches (Jean et al., 2017; Wang et al., 2017; Kuang et al., 2017; Tiedemann and Scherrer, 2017; Maruf and Haffari, 2018; Agrawal et al., 2018; Xiong et al., 2018; Miculicich et al., 2018; Voita et al., 2019a,b; Jean et al., 2019; Junczys-Dowmunt, 2019) proposed contextconditional NMT models trained on documentlevel data. However, none of the previous approaches are able to exploit trained NMT models on sentence-level parallel corpora and require training specialized context-conditional NMT models for document-level machine translation.",
                "cite_spans": [
                    {
                        "start": 62,
                        "end": 81,
                        "text": "(Jean et al., 2017;",
                        "ref_id": "BIBREF23"
                    },
                    {
                        "start": 82,
                        "end": 100,
                        "text": "Wang et al., 2017;",
                        "ref_id": "BIBREF53"
                    },
                    {
                        "start": 101,
                        "end": 120,
                        "text": "Kuang et al., 2017;",
                        "ref_id": "BIBREF29"
                    },
                    {
                        "start": 121,
                        "end": 150,
                        "text": "Tiedemann and Scherrer, 2017;",
                        "ref_id": "BIBREF47"
                    },
                    {
                        "start": 151,
                        "end": 175,
                        "text": "Maruf and Haffari, 2018;",
                        "ref_id": "BIBREF32"
                    },
                    {
                        "start": 176,
                        "end": 197,
                        "text": "Agrawal et al., 2018;",
                        "ref_id": "BIBREF0"
                    },
                    {
                        "start": 198,
                        "end": 217,
                        "text": "Xiong et al., 2018;",
                        "ref_id": "BIBREF57"
                    },
                    {
                        "start": 218,
                        "end": 242,
                        "text": "Miculicich et al., 2018;",
                        "ref_id": "BIBREF34"
                    },
                    {
                        "start": 243,
                        "end": 265,
                        "text": "Voita et al., 2019a,b;",
                        "ref_id": null
                    },
                    {
                        "start": 266,
                        "end": 284,
                        "text": "Jean et al., 2019;",
                        "ref_id": "BIBREF22"
                    },
                    {
                        "start": 285,
                        "end": 307,
                        "text": "Junczys-Dowmunt, 2019)",
                        "ref_id": "BIBREF24"
                    }
                ],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Introduction",
                "sec_num": "1"
            },
            {
                "text": "We propose a way of incorporating context into a trained sentence-level neural machine translation model at decoding time. We process each document monotonically from left to right one sentence at a time and self-train the sentence-level NMT model on its own generated translation. This procedure reinforces choices made by the model and hence increases the chance of making the same choices in the remaining sentences in the document. Our approach does not require training a separate context-conditional model on parallel document-Algorithm 1: Document-level NMT with self-training at decoding time Input: Document D = (X 1 , ..., X n ), pretrained sentence-level NMT model f (\u03b8), learning rate \u03b1, decay prior \u03bb and number of passes over document P Output:",
                "cite_spans": [],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Introduction",
                "sec_num": "1"
            },
            {
                "text": "Translated sentences (Y 1 , ..., Y n )",
                "cite_spans": [],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Introduction",
                "sec_num": "1"
            },
            {
                "text": "Backup original values of parameters\u03b8 \u2190 \u03b8 for p = 1 to P {multi-pass document} do for i = 1 to n do Translate sentence X i using sentence-level model f (\u03b8) into target sentence",
                "cite_spans": [],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Introduction",
                "sec_num": "1"
            },
            {
                "text": "Y i . Calculate cross-entropy loss L(X i , Y i ) using Y i as target. for j = 1 to m do \u03b8 \u2190 \u03b8 \u2212 \u03b1\u2207 \u03b8 L(X i , Y i ) + \u03bb(\u03b8 \u2212 \u03b8)",
                "cite_spans": [],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Introduction",
                "sec_num": "1"
            },
            {
                "text": "end for end for end for level data and allows us to capture context in documents using a trained sentence-level model.",
                "cite_spans": [],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Introduction",
                "sec_num": "1"
            },
            {
                "text": "We make the key contribution in the paper by introducing the document-level neural machine translation approach that does not require training a context-conditional model on document data and does not require separate document-level language model to rank the outputs of the NMT model according to consistency of translated document. We show how to adapt a trained sentence-level neural machine translation model to capture context in the document during decoding. We evaluate and demonstrate improvements of our proposed approach measured by BLEU score and preferences of human annotators on several document-level machine translation tasks including NIST Chinese-English, WMT19 Chinese-English and OpenSubtitles English-Russian datasets. We qualitatively analyze the decoded sentences produced using our approach and show that they indeed capture the context.",
                "cite_spans": [],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Introduction",
                "sec_num": "1"
            },
            {
                "text": "We translate a document D consisting of n source sentences X 1 , X 2 , ..., X n into the target language, given a well-trained sentence-level neural machine translation model f \u03b8 . The sentencelevel model parametrizes a conditional distribution p(Y |X) = T i=1 p(y t |Y <t , X) of each target word y t given the preceding words Y <t and the source sentence X. Decoding is done by approximately finding arg max Y p(Y |X) using greedy decoding or beam-search. f is typically a recurrent neural network with attention (Bahdanau et al., 2014) or a Transformer model (Vaswani et al., 2017) with parameters \u03b8.",
                "cite_spans": [
                    {
                        "start": 515,
                        "end": 538,
                        "text": "(Bahdanau et al., 2014)",
                        "ref_id": "BIBREF5"
                    },
                    {
                        "start": 562,
                        "end": 584,
                        "text": "(Vaswani et al., 2017)",
                        "ref_id": "BIBREF50"
                    }
                ],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Proposed Approach",
                "sec_num": "2"
            },
            {
                "text": "We start by translating a first source sentence X 1 in the document D into the target sentence Y 1 . We then self-train the model on the sentence pair (X 1 , Y 1 ), which maximizes the log probabilities of each word in the generated sentence Y 1 given source sentence X 1 . The self-training procedure runs gradient descent steps for a fixed number of steps with a weight decay. Weight decay keeps the updated values of weights closer to original values. We repeat the same update process for the remaining sentences in the document. The detailed implementation of self-training procedure during decoding is shown in Algorithm 1.",
                "cite_spans": [],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Self-training",
                "sec_num": "2.1"
            },
            {
                "text": "Since the document is processed in the left-to-right, monotonic order, our self-training procedure does not incorporate the choices of the model yet to be made on unprocessed sentences. In order to leverage global information from the full document and to further reinforce the choices made by the model across all generated sentences, we propose multipass document decoding with self-training. Specifically, we process the document multiple times monotonically from left to right while continuing self-training of the model. Multi-pass self-training only requires adding additional parameter P to selftraining Algorithm 1. This parameter specifies the number of passes over the entire document.",
                "cite_spans": [],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Multi-pass self-training",
                "sec_num": "2.2"
            },
            {
                "text": "Since generated sentences are likely to contain some errors, our self-training procedure can reinforce those errors and thus potentially hurt the performance of the model on unprocessed sentences in the document. In order to isolate the effect of imperfect translations and estimate the upper bound of performance, we evaluate our self-training procedure with ground-truth translations as targets, which we call oracle self-training. Running oracle self-training makes it similar to the dynamic evaluation approach introduced in language modeling (Mikolov, 2012; Graves, 2013; Krause et al., 2018) , where input text to the language model is the target used to train the neural language model during evaluation. Oracle self-training is also related to domain adaptation in machine translation (Axelrod et al., 2011; Freitag and Al-Onaizan, 2016; Chu and Wang, 2018) . Unlike domain adaptation in MT, oracle self-training only runs adaptation within a single document and does not rely on the entire in-domain document-level test data. We do not use the oracle in multi-pass self-training since this would make it equivalent to memorizing the correct translation for each sentence in the document and regenerating it again.",
                "cite_spans": [
                    {
                        "start": 547,
                        "end": 562,
                        "text": "(Mikolov, 2012;",
                        "ref_id": "BIBREF35"
                    },
                    {
                        "start": 563,
                        "end": 576,
                        "text": "Graves, 2013;",
                        "ref_id": "BIBREF16"
                    },
                    {
                        "start": 577,
                        "end": 597,
                        "text": "Krause et al., 2018)",
                        "ref_id": "BIBREF28"
                    },
                    {
                        "start": 793,
                        "end": 815,
                        "text": "(Axelrod et al., 2011;",
                        "ref_id": "BIBREF2"
                    },
                    {
                        "start": 816,
                        "end": 845,
                        "text": "Freitag and Al-Onaizan, 2016;",
                        "ref_id": "BIBREF12"
                    },
                    {
                        "start": 846,
                        "end": 865,
                        "text": "Chu and Wang, 2018)",
                        "ref_id": "BIBREF9"
                    }
                ],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Oracle self-training to upper bound performance",
                "sec_num": "2.3"
            },
            {
                "text": "Although there have been some attempts at tackling document-level neural machine translation (for example see proceedings of discourse in machine translation workshop (Popescu-Belis et al., 2019)), it has largely received less attention compared to sentence-level neural machine translation. Prior document-level NMT approaches (Jean et al., 2017; Wang et al., 2017; Kuang et al., 2017; Tiedemann and Scherrer, 2017; Maruf and Haffari, 2018; Agrawal et al., 2018; Miculicich et al., 2018) proposed different ways of conditioning NMT models on several source sentences in the document. Perhaps closest of those document NMT approaches to our work is the approach by Kuang et al. (2017) , where they train a NMT model with a separate non-parametric cache (Kuhn and Mori, 1990 ) that incorporates topic information about the document. Recent approaches (Jean et al., 2019; Junczys-Dowmunt, 2019; Voita et al., 2019a) use only partially available parallel document data or monolingual document data. These approaches proposed to fill in missing context in the documents with random or generated sentences. Another line of document-level NMT work (Xiong et al., 2018; Voita et al., 2019b) proposed a twopass document decoding model inspired by the deliberation network (Xia et al., 2017) in order to incorporate target side document context. A parallel line of work (Garcia et al., 2017 (Garcia et al., , 2019 Yu et al., 2019) introduced document-level approaches that do not require training the context-conditional NMT model by introducing a separate language model to enforce the consistency in the outputs of sentence-level NMT model. Garcia et al. (2019) used a simple n-gram based semantic space language model (Hardmeier et al., 2012) to re-rank the outputs of the sentence-level NMT model inside the beam-search algorithm to enforce documentlevel consistency. Yu et al. (2019) proposed a novel beam search method that incorporates document context inside noisy channel model (Shannon, 1948; Yee et al., 2019) that uses a powerful GPT2 language model (Radford et al., 2019) . Similar to our work, their approach doesn't require training context-conditional models on parallel document corpora, but relies on separate target-to-source NMT model and unconditional language model to re-rank hypotheses of the sourceto-target NMT model.",
                "cite_spans": [
                    {
                        "start": 328,
                        "end": 347,
                        "text": "(Jean et al., 2017;",
                        "ref_id": "BIBREF23"
                    },
                    {
                        "start": 348,
                        "end": 366,
                        "text": "Wang et al., 2017;",
                        "ref_id": "BIBREF53"
                    },
                    {
                        "start": 367,
                        "end": 386,
                        "text": "Kuang et al., 2017;",
                        "ref_id": "BIBREF29"
                    },
                    {
                        "start": 387,
                        "end": 416,
                        "text": "Tiedemann and Scherrer, 2017;",
                        "ref_id": "BIBREF47"
                    },
                    {
                        "start": 417,
                        "end": 441,
                        "text": "Maruf and Haffari, 2018;",
                        "ref_id": "BIBREF32"
                    },
                    {
                        "start": 442,
                        "end": 463,
                        "text": "Agrawal et al., 2018;",
                        "ref_id": "BIBREF0"
                    },
                    {
                        "start": 464,
                        "end": 488,
                        "text": "Miculicich et al., 2018)",
                        "ref_id": "BIBREF34"
                    },
                    {
                        "start": 665,
                        "end": 684,
                        "text": "Kuang et al. (2017)",
                        "ref_id": "BIBREF29"
                    },
                    {
                        "start": 753,
                        "end": 773,
                        "text": "(Kuhn and Mori, 1990",
                        "ref_id": "BIBREF30"
                    },
                    {
                        "start": 850,
                        "end": 869,
                        "text": "(Jean et al., 2019;",
                        "ref_id": "BIBREF22"
                    },
                    {
                        "start": 870,
                        "end": 892,
                        "text": "Junczys-Dowmunt, 2019;",
                        "ref_id": "BIBREF24"
                    },
                    {
                        "start": 893,
                        "end": 913,
                        "text": "Voita et al., 2019a)",
                        "ref_id": "BIBREF51"
                    },
                    {
                        "start": 1142,
                        "end": 1162,
                        "text": "(Xiong et al., 2018;",
                        "ref_id": "BIBREF57"
                    },
                    {
                        "start": 1163,
                        "end": 1183,
                        "text": "Voita et al., 2019b)",
                        "ref_id": "BIBREF52"
                    },
                    {
                        "start": 1264,
                        "end": 1282,
                        "text": "(Xia et al., 2017)",
                        "ref_id": "BIBREF56"
                    },
                    {
                        "start": 1361,
                        "end": 1381,
                        "text": "(Garcia et al., 2017",
                        "ref_id": "BIBREF14"
                    },
                    {
                        "start": 1382,
                        "end": 1404,
                        "text": "(Garcia et al., , 2019",
                        "ref_id": "BIBREF13"
                    },
                    {
                        "start": 1405,
                        "end": 1421,
                        "text": "Yu et al., 2019)",
                        "ref_id": "BIBREF60"
                    },
                    {
                        "start": 1634,
                        "end": 1654,
                        "text": "Garcia et al. (2019)",
                        "ref_id": "BIBREF13"
                    },
                    {
                        "start": 1712,
                        "end": 1736,
                        "text": "(Hardmeier et al., 2012)",
                        "ref_id": "BIBREF17"
                    },
                    {
                        "start": 1863,
                        "end": 1879,
                        "text": "Yu et al. (2019)",
                        "ref_id": "BIBREF60"
                    },
                    {
                        "start": 1978,
                        "end": 1993,
                        "text": "(Shannon, 1948;",
                        "ref_id": "BIBREF44"
                    },
                    {
                        "start": 1994,
                        "end": 2011,
                        "text": "Yee et al., 2019)",
                        "ref_id": "BIBREF59"
                    },
                    {
                        "start": 2053,
                        "end": 2075,
                        "text": "(Radford et al., 2019)",
                        "ref_id": "BIBREF38"
                    }
                ],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Related Work",
                "sec_num": "3"
            },
            {
                "text": "Closest to our work is the dynamic evaluation approach proposed by Mikolov (2012) and further extended by Graves (2013) ; Krause et al. (2018) , where a neural language model is trained at evaluation time. However unlike language modeling where inputs are ground-truth targets used both during training and evaluation, in machine translation ground-truth translation are not available at decoding time in practical settings. The general idea of storing memories in the weights of the neural network rather than storing memories as copies of neural network activations, that is behind our approach and dynamic evaluation, goes back to 1970s and 1980s work on associative memory models (Willshaw et al., 1969; Kohonen, 1972; Anderson and Hinton, 1981; Hopfield, 1982) and to more recent work on fast weights (Ba et al., 2016) .",
                "cite_spans": [
                    {
                        "start": 67,
                        "end": 81,
                        "text": "Mikolov (2012)",
                        "ref_id": "BIBREF35"
                    },
                    {
                        "start": 106,
                        "end": 119,
                        "text": "Graves (2013)",
                        "ref_id": "BIBREF16"
                    },
                    {
                        "start": 122,
                        "end": 142,
                        "text": "Krause et al. (2018)",
                        "ref_id": "BIBREF28"
                    },
                    {
                        "start": 684,
                        "end": 707,
                        "text": "(Willshaw et al., 1969;",
                        "ref_id": "BIBREF54"
                    },
                    {
                        "start": 708,
                        "end": 722,
                        "text": "Kohonen, 1972;",
                        "ref_id": "BIBREF27"
                    },
                    {
                        "start": 723,
                        "end": 749,
                        "text": "Anderson and Hinton, 1981;",
                        "ref_id": "BIBREF1"
                    },
                    {
                        "start": 750,
                        "end": 765,
                        "text": "Hopfield, 1982)",
                        "ref_id": "BIBREF20"
                    },
                    {
                        "start": 806,
                        "end": 823,
                        "text": "(Ba et al., 2016)",
                        "ref_id": null
                    }
                ],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Related Work",
                "sec_num": "3"
            },
            {
                "text": "Our work belongs to the broad category of selftraining or pseudo-labelling approaches (Scudder, 1965; Lee, 2013) proposed to annotate the unlabeled data to train supervised classifiers. Selftraining has been successfully applied to NLP tasks such as word-sense disambiguation (Yarowsky, 1995) and parsing (McClosky et al., 2006; Reichart and Rappoport, 2007; Huang and Harper, 2009) . Self-training has also been used to label monolingual data to improve the performance of sentencelevel statistical and neural machine translation models (Ueffing, 2006; Zhang and Zong, 2016) . Recently, proposed noisy version of self-training and showed improvement over classical self-training on machine translation and text summarization tasks. Backtranslation (Sennrich et al., 2016a) is another popular pseudo-labelling technique that utilizes target-side monolingual data to improve performance of NMT models. Table 1 : Results on NIST evaluation sets. The first four rows show the performance of the previous document-level NMT models from (Wang et al., 2017; Kuang et al., 2017; . The last four rows show performance of our baseline sentence-level Transformer models with and without self-training. BT: backtranslation. Table 2 : Ablation study on NIST evaluation sets measuring the effect on multiple passes of decoding and the oracle on self-training procedure. BT: backtranslation. ST: self-training.",
                "cite_spans": [
                    {
                        "start": 86,
                        "end": 101,
                        "text": "(Scudder, 1965;",
                        "ref_id": "BIBREF40"
                    },
                    {
                        "start": 102,
                        "end": 112,
                        "text": "Lee, 2013)",
                        "ref_id": "BIBREF31"
                    },
                    {
                        "start": 276,
                        "end": 292,
                        "text": "(Yarowsky, 1995)",
                        "ref_id": "BIBREF58"
                    },
                    {
                        "start": 305,
                        "end": 328,
                        "text": "(McClosky et al., 2006;",
                        "ref_id": "BIBREF33"
                    },
                    {
                        "start": 329,
                        "end": 358,
                        "text": "Reichart and Rappoport, 2007;",
                        "ref_id": "BIBREF39"
                    },
                    {
                        "start": 359,
                        "end": 382,
                        "text": "Huang and Harper, 2009)",
                        "ref_id": "BIBREF21"
                    },
                    {
                        "start": 538,
                        "end": 553,
                        "text": "(Ueffing, 2006;",
                        "ref_id": "BIBREF48"
                    },
                    {
                        "start": 554,
                        "end": 575,
                        "text": "Zhang and Zong, 2016)",
                        "ref_id": "BIBREF63"
                    },
                    {
                        "start": 749,
                        "end": 773,
                        "text": "(Sennrich et al., 2016a)",
                        "ref_id": "BIBREF42"
                    },
                    {
                        "start": 1032,
                        "end": 1051,
                        "text": "(Wang et al., 2017;",
                        "ref_id": "BIBREF53"
                    },
                    {
                        "start": 1052,
                        "end": 1071,
                        "text": "Kuang et al., 2017;",
                        "ref_id": "BIBREF29"
                    }
                ],
                "ref_spans": [
                    {
                        "start": 901,
                        "end": 908,
                        "text": "Table 1",
                        "ref_id": null
                    },
                    {
                        "start": 1213,
                        "end": 1220,
                        "text": "Table 2",
                        "ref_id": null
                    }
                ],
                "eq_spans": [],
                "section": "Related Work",
                "sec_num": "3"
            },
            {
                "text": "We use the NIST Chinese-English (Zh-En), the WMT19 Chinese-English (Zh-En) and the Open-Subtitles English-Russian (En-Ru) datasets in our experiments. The NIST training set consists of 1.5M sentence pairs from LDC-distributed news. We use MT06 set as validation set. We use MT03, MT04, MT05 and MT08 sets as held out test sets. The MT06 validation set consists of 1649 sentences with 21 sentences per document. MT03, MT04, MT05 and MT08 consist of 919, 1788, 1082 and 1357 sentences with 9, 9, 11 and 13 sentences on average per document respectively. We follow previous work when preprocessing NIST dataset. We preprocess the NIST dataset with punctuation normalization, tokenization, and lowercasing. Sentences are encoded using byte-pair encoding (Sennrich et al., 2016b) with source and target vocabularies of roughly 32K tokens. We use the case-insensitive multi-bleu.perl script with 4 reference files to evaluate the model. The WMT19 dataset includes the UN corpus, CWMT, and news commentary. We filter the training data by removing duplicate sentences and sen-tences longer than 250 words. The training dataset consits of 18M sentence pairs. We use news-dev2017 as a validation set and use newstest2017, newstest2018 and newstest2019 as held out test sets. newsdev2017, newstest2017, newstest2018 and newstest2019 consist of total of 2002, 2001, 3981 and 2000 sentences with average of 14, 12, 15 and 12 sentences per document respectively. We similarly follow previous work (Xia et al., 2019) when preprocessing the dataset. Chinese sentences are preprocessed by segmenting and normalizing punctuation. English sentences are preprocessed by tokenizing and true casing. We learn a byte-pair encoding (Sennrich et al., 2016b) with source and target vocabularies of roughly 32K tokens. We use sacreBLEU (Post, 2018) for evaluation.",
                "cite_spans": [
                    {
                        "start": 750,
                        "end": 774,
                        "text": "(Sennrich et al., 2016b)",
                        "ref_id": "BIBREF43"
                    },
                    {
                        "start": 1483,
                        "end": 1501,
                        "text": "(Xia et al., 2019)",
                        "ref_id": "BIBREF55"
                    },
                    {
                        "start": 1708,
                        "end": 1732,
                        "text": "(Sennrich et al., 2016b)",
                        "ref_id": "BIBREF43"
                    },
                    {
                        "start": 1809,
                        "end": 1821,
                        "text": "(Post, 2018)",
                        "ref_id": "BIBREF37"
                    }
                ],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Datasets",
                "sec_num": "4.1"
            },
            {
                "text": "The OpenSubtitles English-Russian dataset, consisting of movie and TV subtitles, was prepared by (Voita et al., 2019b) . 1 The training dataset consists of 6M parallel sentence pairs. We use the context aware sets provided by the authors consisting of 10000 documents both in validation and test sets. Due to the way the dataset is processed, each document only contains 4 sentences. The dataset is preprocessed by tokenizing and lower casing. We use byte-pair encoding (Sennrich et al., 2016b) to prepare source and target vocabularies of roughly 32K tokens. We use multi-bleu.perl script for evaluation.",
                "cite_spans": [
                    {
                        "start": 97,
                        "end": 118,
                        "text": "(Voita et al., 2019b)",
                        "ref_id": "BIBREF52"
                    },
                    {
                        "start": 121,
                        "end": 122,
                        "text": "1",
                        "ref_id": null
                    },
                    {
                        "start": 470,
                        "end": 494,
                        "text": "(Sennrich et al., 2016b)",
                        "ref_id": "BIBREF43"
                    }
                ],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Datasets",
                "sec_num": "4.1"
            },
            {
                "text": "We train a Transformer (Vaswani et al., 2017) on all datasets. Following previous Voita et al., 2019b; Xia et al., 2019) work we use the Transformer base configuration (transformer_base) on the NIST Zh-En and the OpenSubtitles En-Ru datasets and use the Transformer big configuration (transformer_big) on the WMT19 Zh-En dataset. Transformer base consists of 6 layers, 512 hidden units and 8 attention heads. Transformer big consists of 6 layers, 1024 hidden units and 16 attention heads. We use a dropout rate (Srivastava et al., 2014) of 0.1 and label smoothing to regularize our models. We train our models with the Adam optimizer (Kingma and Ba, 2014) using the same warm-up learning rate schedule as in (Vaswani et al., 2017) . During decoding we use beam search with beam size 4 and length penalty 0.6. We additionally train backtranslated models (Sennrich et al., 2016a) on the NIST Zh-En and the OpenSubtitles En-Ru datasets. We use the publicly available English gigaword dataset (Graff et al., 2003) to create synthetic parallel data for the NIST Zh-En dataset and use synthetic parallel data provided by (Voita et al., 2019a) for the OpenSubtitles En-Ru dataset. When training backtranslated models, we oversample the original parallel data to make the ratio of synthetic data to original data equal to 1 (Edunov et al., 2018) . We tune the number of update steps, learning rate, decay rate, and number of passes over the document of our selftraining approach with a random search on a validation set. We use the range of (5 \u00d7 10 \u22125 , 5 \u00d7 10 \u22121 ) for learning rate, range of (0.001, 0.999) for decay rate, number of update steps (2, 4, 8) and number of passes over the document (2, 4) for random search. We found that best performing models required a small number of update steps (either 2 or 4) with a relatively large learning rate (\u223c 0.005 \u2212 0.01) and small decay rate (\u223c 0.2 \u2212 0.5). We use 3 random seeds to train each model in our experiments and report the average results. We use the Ten-sor2Tensor library (Vaswani et al., 2018) to train baseline models and to implement our method.",
                "cite_spans": [
                    {
                        "start": 23,
                        "end": 45,
                        "text": "(Vaswani et al., 2017)",
                        "ref_id": "BIBREF50"
                    },
                    {
                        "start": 82,
                        "end": 102,
                        "text": "Voita et al., 2019b;",
                        "ref_id": "BIBREF52"
                    },
                    {
                        "start": 103,
                        "end": 120,
                        "text": "Xia et al., 2019)",
                        "ref_id": "BIBREF55"
                    },
                    {
                        "start": 708,
                        "end": 730,
                        "text": "(Vaswani et al., 2017)",
                        "ref_id": "BIBREF50"
                    },
                    {
                        "start": 853,
                        "end": 877,
                        "text": "(Sennrich et al., 2016a)",
                        "ref_id": "BIBREF42"
                    },
                    {
                        "start": 989,
                        "end": 1009,
                        "text": "(Graff et al., 2003)",
                        "ref_id": "BIBREF15"
                    },
                    {
                        "start": 1115,
                        "end": 1136,
                        "text": "(Voita et al., 2019a)",
                        "ref_id": "BIBREF51"
                    },
                    {
                        "start": 1316,
                        "end": 1337,
                        "text": "(Edunov et al., 2018)",
                        "ref_id": "BIBREF10"
                    },
                    {
                        "start": 2026,
                        "end": 2048,
                        "text": "(Vaswani et al., 2018)",
                        "ref_id": null
                    }
                ],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Hyperparameters",
                "sec_num": "4.2"
            },
            {
                "text": "We present translation quality results measured by BLEU on NIST dataset on Table 1 . The selftraining procedure improves the results of our sentence-level baseline by the average of 0.53 BLEU for non-backtranslated model and by 0.93 BLEU for backtranslated model for all evaluation sets. Our baseline sentence-level Transformer model trained without backtranslation outperforms previous document-level models by Wang et al. (2017) and Kuang et al. (2017) and is comparable to the document-level model proposed by . Backtranslation further improves the results of our sentence-level model leading to higher BLEU score compared to the Document Transformer .",
                "cite_spans": [
                    {
                        "start": 412,
                        "end": 430,
                        "text": "Wang et al. (2017)",
                        "ref_id": "BIBREF53"
                    },
                    {
                        "start": 435,
                        "end": 454,
                        "text": "Kuang et al. (2017)",
                        "ref_id": "BIBREF29"
                    }
                ],
                "ref_spans": [
                    {
                        "start": 75,
                        "end": 82,
                        "text": "Table 1",
                        "ref_id": null
                    }
                ],
                "eq_spans": [],
                "section": "Results",
                "sec_num": "5"
            },
            {
                "text": "In Table 2 , we show a detailed study of effects of multi-pass self-training and oracle self-training on BLEU scores on NIST evaluation sets. First, multiple decoding passes over the document give an additional average improvement of 0.25\u22120.45 BLEU points compared to the single decoding pass over the document. Using oracle self-training procedure gives an average of 0.86 and 1.63 BLEU improvement over our non-backtranslated and backtranslated sentence-level baseline models respectively. Compared to using generated translations by the model, oracle self-training gives an improvement of 0.3 and 0.7 BLEU points for non-backtranslated and backtranslated models respectively.",
                "cite_spans": [],
                "ref_spans": [
                    {
                        "start": 3,
                        "end": 10,
                        "text": "Table 2",
                        "ref_id": null
                    }
                ],
                "eq_spans": [],
                "section": "Results",
                "sec_num": "5"
            },
            {
                "text": "The results on the WMT19 evaluation sets are presented on Table 3 . Compared to the NIST dataset our self-training procedure shows an improvement of 0.1 BLEU over a sentence-level baseline model. Oracle self-training outperforms sentence-level baselines by a significant margin of 2.5 BLEU. We hypothesize that such a large gap between performance of oracle and non-oracle selftraining is due to the more challenging nature of the WMT dataset which is reflected in the worse performance of sentence-level baseline on WMT compared to NIST. We investigate this claim by measuring the relationship between BLEU achieved by self-training and the relative quality of the sentencelevel model on the NIST dataset. Figure 1 shows that the BLEU difference between self-training and sentence-level models monotonically increases as the quality of the sentence-level model gets better on the NIST dataset. This implies that we can expect a larger improvement from applying selftraining as we improve the sentence-level model (Xia et al., 2019) . All models were trained without additional monolingual data and without pretraining. ST: self-training. on the WMT dataset. Preliminary experiments on training back-translated models didn't improve results on the WMT dataset. We leave further investigation of ways to improve the sentence-level model on the WMT dataset for future work. The results on OpenSubtitles evaluation sets are in Table 4 . Our self-training and oracle self-training approaches give the performance improvement of 0.1 and 0.3 BLEU respectively. We hypothesize that the small improvement of self-training is due to relatively small number of sentences in the documents in the OpenSubtitles dataset. We validate this claim by varying the number of sentences in the document used for self-training on NIST dataset. Figure 2 shows that the self-training approach achieves higher BLEU improvement as we increase the number of sentences in documents used for self-training.",
                "cite_spans": [
                    {
                        "start": 1014,
                        "end": 1032,
                        "text": "(Xia et al., 2019)",
                        "ref_id": "BIBREF55"
                    }
                ],
                "ref_spans": [
                    {
                        "start": 58,
                        "end": 65,
                        "text": "Table 3",
                        "ref_id": "TABREF3"
                    },
                    {
                        "start": 707,
                        "end": 715,
                        "text": "Figure 1",
                        "ref_id": "FIGREF1"
                    },
                    {
                        "start": 1424,
                        "end": 1431,
                        "text": "Table 4",
                        "ref_id": "TABREF5"
                    },
                    {
                        "start": 1822,
                        "end": 1830,
                        "text": "Figure 2",
                        "ref_id": "FIGREF2"
                    }
                ],
                "eq_spans": [],
                "section": "Results",
                "sec_num": "5"
            },
            {
                "text": "We conduct a human evaluation study on the NIST Zh-En and the OpenSubtitles En-Ru datasets. For both datasets we sample 50 documents from the test set where translated documents generated by the self-training approach are not exact copies of the translated documents generated by the sentencelevel baseline model. For the NIST Zh-En dataset we present reference documents, translated documents generated by the sentence-level baseline, and translated documents generated by self-training approach to 4 native English speakers. For the Open-Subtitles En-Ru dataset we follow a similar setup, where we present reference documents, translated documents generated by sentence-level baseline, and translated documents generated by self-training approach to 4 native Russian speakers. All translated documents are presented in random order with no indication of which approach was used to generate them. We highlight the differences between translated documents when presenting them to human evaluators. The human evaluators are asked to pick one of two translations as their preferred option for each document. We ask the human evaluators to consider fluency, idiomaticity and correctness of the translation relative to the reference when entering their preferred choices.",
                "cite_spans": [],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Human Evaluation",
                "sec_num": "6"
            },
            {
                "text": "We follow the setup of Yu et al. (2019) when performing human evaluation. We collect a total of 200 annotations for 50 documents from all 4 human evaluators and show results in Table 5 . For both datasets, human evaluators prefer translated documents generated by the self-training approach to translated documents generated by the sentence-level model. For NIST Zh-En, 122 out of 200 annotations indicate a preference towards translations generated by self-training approach. For OpenSubtitles En-Ru, 118 out of 200 annotations similarly show a preference towards translations generated by our self-training approach. This is a statistically significant preference p < 0.05 according to two-sided Binomial test. When aggregated for each document by majority vote, for NIST Zh-En, translations generated by the selftraining approach are considered better in 25 documents, worse in 12 documents, and the same in 13 documents. For OpenSubtitles En-Ru, translations generated by self-training approach are considered better in 23 documents, worse in 15 documents, and the same in 12 documents. The agreement between annotators for NIST Zh-En and OpenSub- Table 5 : Human evaluation results on the NIST Zh-En and the OpenSubtitles En-Ru datasets. \"Total\" denotes total number of annotations collected from humans. \"Self-train\" denotes number of times evaluators preferred documents by the self-training approach. \"Baseline\" denotes number of times evaluators preferred documents by sentence-level baseline.",
                "cite_spans": [
                    {
                        "start": 23,
                        "end": 39,
                        "text": "Yu et al. (2019)",
                        "ref_id": "BIBREF60"
                    }
                ],
                "ref_spans": [
                    {
                        "start": 177,
                        "end": 184,
                        "text": "Table 5",
                        "ref_id": null
                    },
                    {
                        "start": 1152,
                        "end": 1159,
                        "text": "Table 5",
                        "ref_id": null
                    }
                ],
                "eq_spans": [],
                "section": "Human Evaluation",
                "sec_num": "6"
            },
            {
                "text": "titles En-Ru is \u03ba = 0.293 and \u03ba = 0.320 according to Fleiss' kappa (Fleiss, 1971) . For both datasets, the inter-annotator agreement rate is considered fair. The agreement rate is similar to the inter-annotator agreement found in the previous WMT human evaluation studies (Bojar et al., 2014) .",
                "cite_spans": [
                    {
                        "start": 67,
                        "end": 81,
                        "text": "(Fleiss, 1971)",
                        "ref_id": "BIBREF11"
                    },
                    {
                        "start": 272,
                        "end": 292,
                        "text": "(Bojar et al., 2014)",
                        "ref_id": "BIBREF8"
                    }
                ],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Human Evaluation",
                "sec_num": "6"
            },
            {
                "text": "In Table 6 , we show four reference document pairs together with translated documents generated by the baseline sentence-level model and by our selftraining approach. We emphasize the underlined words in all documents.",
                "cite_spans": [],
                "ref_spans": [
                    {
                        "start": 3,
                        "end": 10,
                        "text": "Table 6",
                        "ref_id": null
                    }
                ],
                "eq_spans": [],
                "section": "Qualitative Results",
                "sec_num": "7"
            },
            {
                "text": "In the first two examples we emphasize the gender of the person marked on verbs and adjectives in translated Russian sentences. In the first example, the baseline sentence-level model inconsistenly produces different gender markings on the underlined verb \u0441\u043a\u0430\u0437\u0430\u043b (masculine told) and underlined adjective \u0441\u0438\u043b\u044c\u043d\u043e\u0439 (feminine strong). The selftraining approach correctly generates a translation with consistent male gender markings on both the underlined verb \u0441\u043a\u0430\u0437\u0430\u043b and the underlined adjective \u0441\u0438\u043b\u044c\u043d\u044b\u043c. Similarly, in the second example, the baseline model inconsistenly produces different gender markings on the underlined verbs \u043f\u0440\u0438\u0433\u043b\u0430\u0448\u0435\u043d\u0430 (feminine invited) and \u043f\u043e\u0440\u0443\u0433\u0430\u043b\u0441\u044f (masculine fought). Self-training consistently generates female gender markings on both the underlined verbs \u043f\u0440\u0438\u0433\u043b\u0430\u0448\u0435\u043d\u0430 (feminine invited) and \u043f\u043e\u0441\u0441\u043e\u0440\u0438\u043b\u0430\u0441\u044c (feminine fought).",
                "cite_spans": [],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Qualitative Results",
                "sec_num": "7"
            },
            {
                "text": "In the third example, we emphasize the underlined named entity in reference and generated translations. The baseline sentence-level model inconsistently generates the names \"doyle\" and \"du\" when referring to the same entity across two sentences in the same document. The self-training approach consistently uses the name \"doyle\" across two sentences when referring to the same entity. In the fourth example, we emphasize the plurality of the underlined words. The baseline model inconsistenly generates both singular and plural forms when referring to same noun in consecutive sentences. Self-training generates the noun \"pilots\" in correct plural form in both sentences.",
                "cite_spans": [],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Qualitative Results",
                "sec_num": "7"
            },
            {
                "text": "In this paper, we propose a way of incorporating the document context inside a trained sentencelevel neural machine translation model using selftraining. We process documents from left to right multiple times and self-train the sentence-level NMT model on the pair of source sentence and generated target sentence. This reinforces the choices made by the NMT model thus making it more likely that the choices will be repeated in the rest of the document.",
                "cite_spans": [],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Conclusion",
                "sec_num": "8"
            },
            {
                "text": "We demonstrate the feasibility of our approach on three machine translation datasets: NIST Zh-En, WMT19 Zh-En and OpenSubtitles En-Ru. We show that self-training improves sentence-level Ref we are actively seeking a local partner to set up a joint fund company , \" duchateau said . duchateau said that the chinese market still has ample potentials . Baseline we are actively looking for a local partner to establish a joint venture fund company , \" doyle said .",
                "cite_spans": [],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Conclusion",
                "sec_num": "8"
            },
            {
                "text": "du said that there is still a lot of room for the chinese market . Ours we are actively looking for a local partner to establish a joint venture fund company , \" doyle said . doyle said that there is still great room for the chinese market .",
                "cite_spans": [],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Conclusion",
                "sec_num": "8"
            },
            {
                "text": "Ref in may this year , 13 pilots with china eastern airlines wuhan company in succession handed in their resignations , which were rejected by the company . soon afterwards , the pilots applied one after another at the beginning of june to the labor dispute arbitration commission of hubei province for labor arbitration , requesting for a ruling that their labor relationship with china eastern airlines wuhan company be terminated . Baseline in may this year , 13 pilots of china eastern 's wuhan company submitted their resignations one after another , but the company refused . the pilot then applied for labor arbitration with the hubei province labor dispute arbitration committee in early june , requesting the ruling to terminate the labor relationship with the wuhan company of china eastern airlines . Ours in may this year , 13 pilots of china eastern 's wuhan company submitted their resignations one after another , but the company refused . subsequently , in early june , the pilots successively applied for labor arbitration with the hubei province labor dispute arbitration committee , requesting that the labor relationship with china eastern airlines be terminated . Table 6 : Four reference documents together with translations generated by the baseline sentence-level model and by our self-training approach. First two documents are taken from the OpenSubtitles English-Russian and second two documents are taken from the NIST Chinese-English dataset.",
                "cite_spans": [],
                "ref_spans": [
                    {
                        "start": 1185,
                        "end": 1192,
                        "text": "Table 6",
                        "ref_id": null
                    }
                ],
                "eq_spans": [],
                "section": "Conclusion",
                "sec_num": "8"
            },
            {
                "text": "baselines by up to 0.93 BLEU. We also conduct a human evaluation study and show a strong preference of the annotators to the translated documents generated by our self-training approach. Our analysis demonstrates that self-training achieves higher improvement on longer documents and using better sentence-level models.",
                "cite_spans": [],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Conclusion",
                "sec_num": "8"
            },
            {
                "text": "In this work, we only use self-training on sourceto-target NMT models in order to capture the target side document context. One extension could investigate the application of self-training on both target-to-source and source-to-target sentence-level models to incorporate both source and target document context into generated translations. Overall, we hope that our work would motivate novel approaches of making trained sentence-level models better suited for document translation at decoding time.",
                "cite_spans": [],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Conclusion",
                "sec_num": "8"
            },
            {
                "text": "https://github.com/lena-voita/ good-translation-wrong-in-context",
                "cite_spans": [],
                "ref_spans": [],
                "eq_spans": [],
                "section": "",
                "sec_num": null
            }
        ],
        "back_matter": [
            {
                "text": "We would like to thank Phil Blunsom, Kris Cao, Kyunghyun Cho, Chris Dyer, Wojciech Stokowiec and members of the Language team for helpful suggestions.",
                "cite_spans": [],
                "ref_spans": [],
                "eq_spans": [],
                "section": "Acknowledgements",
                "sec_num": "9"
            }
        ],
        "bib_entries": {
            "BIBREF0": {
                "ref_id": "b0",
                "title": "Contextual handling in neural machine translation: Look behind, ahead and on both sides",
                "authors": [
                    {
                        "first": "Ruchit",
                        "middle": [],
                        "last": "Agrawal",
                        "suffix": ""
                    },
                    {
                        "first": "Marco",
                        "middle": [],
                        "last": "Turchi",
                        "suffix": ""
                    },
                    {
                        "first": "Matteo",
                        "middle": [],
                        "last": "Negri",
                        "suffix": ""
                    }
                ],
                "year": 2018,
                "venue": "",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Ruchit Agrawal, Marco Turchi, and Matteo Negri. 2018. Contextual handling in neural machine trans- lation: Look behind, ahead and on both sides.",
                "links": null
            },
            "BIBREF1": {
                "ref_id": "b1",
                "title": "Models of information processing in the brain. Parallel models of associative memory",
                "authors": [
                    {
                        "first": "A",
                        "middle": [],
                        "last": "James",
                        "suffix": ""
                    },
                    {
                        "first": "Geoffrey",
                        "middle": [
                            "E"
                        ],
                        "last": "Anderson",
                        "suffix": ""
                    },
                    {
                        "first": "",
                        "middle": [],
                        "last": "Hinton",
                        "suffix": ""
                    }
                ],
                "year": 1981,
                "venue": "",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "James A Anderson and Geoffrey E Hinton. 1981. Mod- els of information processing in the brain. Parallel models of associative memory.",
                "links": null
            },
            "BIBREF2": {
                "ref_id": "b2",
                "title": "Domain adaptation via pseudo in-domain data selection",
                "authors": [
                    {
                        "first": "A",
                        "middle": [],
                        "last": "Axelrod",
                        "suffix": ""
                    },
                    {
                        "first": "X",
                        "middle": [],
                        "last": "He",
                        "suffix": ""
                    },
                    {
                        "first": "Jianfeng",
                        "middle": [],
                        "last": "Gao",
                        "suffix": ""
                    }
                ],
                "year": 2011,
                "venue": "EMNLP",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "A. Axelrod, X. He, and Jianfeng Gao. 2011. Domain adaptation via pseudo in-domain data selection. In EMNLP.",
                "links": null
            },
            "BIBREF4": {
                "ref_id": "b4",
                "title": "Using fast weights to attend to the recent past",
                "authors": [
                    {
                        "first": "Joel",
                        "middle": [
                            "Z"
                        ],
                        "last": "Leibo",
                        "suffix": ""
                    },
                    {
                        "first": "Catalin",
                        "middle": [],
                        "last": "Ionescu",
                        "suffix": ""
                    }
                ],
                "year": 2016,
                "venue": "NIPS",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Joel Z. Leibo, and Catalin Ionescu. 2016. Using fast weights to attend to the recent past. In NIPS.",
                "links": null
            },
            "BIBREF5": {
                "ref_id": "b5",
                "title": "Neural machine translation by jointly learning to align and translate",
                "authors": [
                    {
                        "first": "Dzmitry",
                        "middle": [],
                        "last": "Bahdanau",
                        "suffix": ""
                    },
                    {
                        "first": "Kyunghyun",
                        "middle": [],
                        "last": "Cho",
                        "suffix": ""
                    },
                    {
                        "first": "Yoshua",
                        "middle": [],
                        "last": "Bengio",
                        "suffix": ""
                    }
                ],
                "year": 2014,
                "venue": "",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {
                    "arXiv": [
                        "arXiv:1409.0473"
                    ]
                },
                "num": null,
                "urls": [],
                "raw_text": "Dzmitry Bahdanau, Kyunghyun Cho, and Yoshua Ben- gio. 2014. Neural machine translation by jointly learning to align and translate. arXiv preprint arXiv:1409.0473.",
                "links": null
            },
            "BIBREF6": {
                "ref_id": "b6",
                "title": "Proceedings of the Fifth Conference on Machine Translation",
                "authors": [
                    {
                        "first": "Lo\u00efc",
                        "middle": [],
                        "last": "Barrault",
                        "suffix": ""
                    },
                    {
                        "first": "Magdalena",
                        "middle": [],
                        "last": "Biesialska",
                        "suffix": ""
                    },
                    {
                        "first": "Ond\u0159ej",
                        "middle": [],
                        "last": "Bojar",
                        "suffix": ""
                    },
                    {
                        "first": "Marta",
                        "middle": [
                            "R"
                        ],
                        "last": "Costa-Juss\u00e0",
                        "suffix": ""
                    },
                    {
                        "first": "Christian",
                        "middle": [],
                        "last": "Federmann",
                        "suffix": ""
                    },
                    {
                        "first": "Yvette",
                        "middle": [],
                        "last": "Graham",
                        "suffix": ""
                    },
                    {
                        "first": "Roman",
                        "middle": [],
                        "last": "Grundkiewicz",
                        "suffix": ""
                    },
                    {
                        "first": "Barry",
                        "middle": [],
                        "last": "Haddow",
                        "suffix": ""
                    },
                    {
                        "first": "Matthias",
                        "middle": [],
                        "last": "Huck",
                        "suffix": ""
                    },
                    {
                        "first": "Eric",
                        "middle": [],
                        "last": "Joanis",
                        "suffix": ""
                    },
                    {
                        "first": "Tom",
                        "middle": [],
                        "last": "Kocmi",
                        "suffix": ""
                    },
                    {
                        "first": "Philipp",
                        "middle": [],
                        "last": "Koehn",
                        "suffix": ""
                    },
                    {
                        "first": "Chi-Kiu",
                        "middle": [],
                        "last": "Lo",
                        "suffix": ""
                    },
                    {
                        "first": "Nikola",
                        "middle": [],
                        "last": "Ljube\u0161i\u0107",
                        "suffix": ""
                    },
                    {
                        "first": "Christof",
                        "middle": [],
                        "last": "Monz",
                        "suffix": ""
                    },
                    {
                        "first": "Makoto",
                        "middle": [],
                        "last": "Morishita",
                        "suffix": ""
                    },
                    {
                        "first": "Masaaki",
                        "middle": [],
                        "last": "Nagata",
                        "suffix": ""
                    },
                    {
                        "first": "Toshiaki",
                        "middle": [],
                        "last": "Nakazawa",
                        "suffix": ""
                    }
                ],
                "year": null,
                "venue": "",
                "volume": "",
                "issue": "",
                "pages": "1--55",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Lo\u00efc Barrault, Magdalena Biesialska, Ond\u0159ej Bojar, Marta R. Costa-juss\u00e0, Christian Federmann, Yvette Graham, Roman Grundkiewicz, Barry Haddow, Matthias Huck, Eric Joanis, Tom Kocmi, Philipp Koehn, Chi-kiu Lo, Nikola Ljube\u0161i\u0107, Christof Monz, Makoto Morishita, Masaaki Nagata, Toshi- aki Nakazawa, Santanu Pal, Matt Post, and Marcos Zampieri. 2020. Findings of the 2020 conference on machine translation (WMT20). In Proceedings of the Fifth Conference on Machine Translation, pages 1-55, Online. Association for Computational Lin- guistics.",
                "links": null
            },
            "BIBREF7": {
                "ref_id": "b7",
                "title": "Santanu Pal, Matt Post, and Marcos Zampieri. 2019. Findings of the 2019 conference on machine translation (WMT19). In ACL",
                "authors": [
                    {
                        "first": "Lo\u00efc",
                        "middle": [],
                        "last": "Barrault",
                        "suffix": ""
                    },
                    {
                        "first": "Ond\u0159ej",
                        "middle": [],
                        "last": "Bojar",
                        "suffix": ""
                    },
                    {
                        "first": "Marta",
                        "middle": [
                            "R"
                        ],
                        "last": "Costa-Juss\u00e0",
                        "suffix": ""
                    },
                    {
                        "first": "Christian",
                        "middle": [],
                        "last": "Federmann",
                        "suffix": ""
                    },
                    {
                        "first": "Mark",
                        "middle": [],
                        "last": "Fishel",
                        "suffix": ""
                    },
                    {
                        "first": "Yvette",
                        "middle": [],
                        "last": "Graham",
                        "suffix": ""
                    },
                    {
                        "first": "Barry",
                        "middle": [],
                        "last": "Haddow",
                        "suffix": ""
                    },
                    {
                        "first": "Matthias",
                        "middle": [],
                        "last": "Huck",
                        "suffix": ""
                    },
                    {
                        "first": "Philipp",
                        "middle": [],
                        "last": "Koehn",
                        "suffix": ""
                    },
                    {
                        "first": "Shervin",
                        "middle": [],
                        "last": "Malmasi",
                        "suffix": ""
                    },
                    {
                        "first": "Christof",
                        "middle": [],
                        "last": "Monz",
                        "suffix": ""
                    },
                    {
                        "first": "Mathias",
                        "middle": [],
                        "last": "M\u00fcller",
                        "suffix": ""
                    }
                ],
                "year": null,
                "venue": "",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Lo\u00efc Barrault, Ond\u0159ej Bojar, Marta R. Costa-juss\u00e0, Christian Federmann, Mark Fishel, Yvette Gra- ham, Barry Haddow, Matthias Huck, Philipp Koehn, Shervin Malmasi, Christof Monz, Mathias M\u00fcller, Santanu Pal, Matt Post, and Marcos Zampieri. 2019. Findings of the 2019 conference on machine transla- tion (WMT19). In ACL.",
                "links": null
            },
            "BIBREF8": {
                "ref_id": "b8",
                "title": "Findings of the 2014 workshop on statistical machine translation",
                "authors": [
                    {
                        "first": "Ondrej",
                        "middle": [],
                        "last": "Bojar",
                        "suffix": ""
                    },
                    {
                        "first": "C",
                        "middle": [],
                        "last": "Buck",
                        "suffix": ""
                    },
                    {
                        "first": "C",
                        "middle": [],
                        "last": "Federmann",
                        "suffix": ""
                    },
                    {
                        "first": "B",
                        "middle": [],
                        "last": "Haddow",
                        "suffix": ""
                    },
                    {
                        "first": "Philipp",
                        "middle": [],
                        "last": "Koehn",
                        "suffix": ""
                    },
                    {
                        "first": "Johannes",
                        "middle": [],
                        "last": "Leveling",
                        "suffix": ""
                    },
                    {
                        "first": "Christof",
                        "middle": [],
                        "last": "Monz",
                        "suffix": ""
                    },
                    {
                        "first": "Pavel",
                        "middle": [],
                        "last": "Pecina",
                        "suffix": ""
                    },
                    {
                        "first": "Matt",
                        "middle": [],
                        "last": "Post",
                        "suffix": ""
                    },
                    {
                        "first": "Herve",
                        "middle": [],
                        "last": "Saint-Amand",
                        "suffix": ""
                    },
                    {
                        "first": "Radu",
                        "middle": [],
                        "last": "Soricut",
                        "suffix": ""
                    },
                    {
                        "first": "Lucia",
                        "middle": [],
                        "last": "Specia",
                        "suffix": ""
                    },
                    {
                        "first": "A",
                        "middle": [],
                        "last": "Tamchyna",
                        "suffix": ""
                    }
                ],
                "year": 2014,
                "venue": "WMT@ACL",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Ondrej Bojar, C. Buck, C. Federmann, B. Haddow, Philipp Koehn, Johannes Leveling, Christof Monz, Pavel Pecina, Matt Post, Herve Saint-Amand, Radu Soricut, Lucia Specia, and A. Tamchyna. 2014. Findings of the 2014 workshop on statistical ma- chine translation. In WMT@ACL.",
                "links": null
            },
            "BIBREF9": {
                "ref_id": "b9",
                "title": "A survey of domain adaptation for neural machine translation",
                "authors": [
                    {
                        "first": "Chenhui",
                        "middle": [],
                        "last": "Chu",
                        "suffix": ""
                    },
                    {
                        "first": "Rui",
                        "middle": [],
                        "last": "Wang",
                        "suffix": ""
                    }
                ],
                "year": 2018,
                "venue": "Proceedings of the 27th International Conference on Computational Linguistics",
                "volume": "",
                "issue": "",
                "pages": "1304--1319",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Chenhui Chu and Rui Wang. 2018. A survey of do- main adaptation for neural machine translation. In Proceedings of the 27th International Conference on Computational Linguistics, pages 1304-1319, Santa Fe, New Mexico, USA. Association for Computa- tional Linguistics.",
                "links": null
            },
            "BIBREF10": {
                "ref_id": "b10",
                "title": "Understanding back-translation at scale",
                "authors": [
                    {
                        "first": "Sergey",
                        "middle": [],
                        "last": "Edunov",
                        "suffix": ""
                    },
                    {
                        "first": "Myle",
                        "middle": [],
                        "last": "Ott",
                        "suffix": ""
                    },
                    {
                        "first": "Michael",
                        "middle": [],
                        "last": "Auli",
                        "suffix": ""
                    },
                    {
                        "first": "David",
                        "middle": [],
                        "last": "Grangier",
                        "suffix": ""
                    }
                ],
                "year": 2018,
                "venue": "EMNLP",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Sergey Edunov, Myle Ott, Michael Auli, and David Grangier. 2018. Understanding back-translation at scale. In EMNLP.",
                "links": null
            },
            "BIBREF11": {
                "ref_id": "b11",
                "title": "Measuring nominal scale agreement among many raters",
                "authors": [
                    {
                        "first": "Joseph",
                        "middle": [
                            "L"
                        ],
                        "last": "Fleiss",
                        "suffix": ""
                    }
                ],
                "year": 1971,
                "venue": "Psychological Bulletin",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Joseph L. Fleiss. 1971. Measuring nominal scale agree- ment among many raters. Psychological Bulletin.",
                "links": null
            },
            "BIBREF12": {
                "ref_id": "b12",
                "title": "Fast domain adaptation for neural machine translation",
                "authors": [
                    {
                        "first": "Markus",
                        "middle": [],
                        "last": "Freitag",
                        "suffix": ""
                    },
                    {
                        "first": "Y",
                        "middle": [],
                        "last": "Al-Onaizan",
                        "suffix": ""
                    }
                ],
                "year": 2016,
                "venue": "ArXiv",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Markus Freitag and Y. Al-Onaizan. 2016. Fast domain adaptation for neural machine translation. ArXiv, abs/1612.06897.",
                "links": null
            },
            "BIBREF13": {
                "ref_id": "b13",
                "title": "Context-aware neural machine translation decoding",
                "authors": [
                    {
                        "first": "Eva Mart\u00ednez",
                        "middle": [],
                        "last": "Garcia",
                        "suffix": ""
                    },
                    {
                        "first": "C",
                        "middle": [],
                        "last": "Creus",
                        "suffix": ""
                    },
                    {
                        "first": "C",
                        "middle": [],
                        "last": "Espa\u00f1a-Bonet",
                        "suffix": ""
                    }
                ],
                "year": 2019,
                "venue": "",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Eva Mart\u00ednez Garcia, C. Creus, and C. Espa\u00f1a-Bonet. 2019. Context-aware neural machine translation de- coding. In DiscoMT@EMNLP.",
                "links": null
            },
            "BIBREF14": {
                "ref_id": "b14",
                "title": "Using word embeddings to enforce document-level lexical consistency in machine translation",
                "authors": [
                    {
                        "first": "Eva Mart\u00ednez",
                        "middle": [],
                        "last": "Garcia",
                        "suffix": ""
                    },
                    {
                        "first": "C",
                        "middle": [],
                        "last": "Creus",
                        "suffix": ""
                    },
                    {
                        "first": "C",
                        "middle": [],
                        "last": "Espa\u00f1a-Bonet",
                        "suffix": ""
                    },
                    {
                        "first": "Llu\u00eds",
                        "middle": [],
                        "last": "M\u00e0rquez I Villodre",
                        "suffix": ""
                    }
                ],
                "year": 2017,
                "venue": "The Prague Bulletin of Mathematical Linguistics",
                "volume": "108",
                "issue": "",
                "pages": "85--96",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Eva Mart\u00ednez Garcia, C. Creus, C. Espa\u00f1a-Bonet, and Llu\u00eds M\u00e0rquez i Villodre. 2017. Using word embed- dings to enforce document-level lexical consistency in machine translation. The Prague Bulletin of Math- ematical Linguistics, 108:85 -96.",
                "links": null
            },
            "BIBREF15": {
                "ref_id": "b15",
                "title": "English gigaword. Linguistic Data Consortium",
                "authors": [
                    {
                        "first": "David",
                        "middle": [],
                        "last": "Graff",
                        "suffix": ""
                    },
                    {
                        "first": "Junbo",
                        "middle": [],
                        "last": "Kong",
                        "suffix": ""
                    },
                    {
                        "first": "Ke",
                        "middle": [],
                        "last": "Chen",
                        "suffix": ""
                    },
                    {
                        "first": "Kazuaki",
                        "middle": [],
                        "last": "Maeda",
                        "suffix": ""
                    }
                ],
                "year": 2003,
                "venue": "",
                "volume": "4",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "David Graff, Junbo Kong, Ke Chen, and Kazuaki Maeda. 2003. English gigaword. Linguistic Data Consortium, Philadelphia, 4(1):34.",
                "links": null
            },
            "BIBREF16": {
                "ref_id": "b16",
                "title": "Generating sequences with recurrent neural networks",
                "authors": [
                    {
                        "first": "Alex",
                        "middle": [],
                        "last": "Graves",
                        "suffix": ""
                    }
                ],
                "year": 2013,
                "venue": "",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {
                    "arXiv": [
                        "arXiv:1308.0850"
                    ]
                },
                "num": null,
                "urls": [],
                "raw_text": "Alex Graves. 2013. Generating sequences with recurrent neural networks. arXiv preprint arXiv:1308.0850.",
                "links": null
            },
            "BIBREF17": {
                "ref_id": "b17",
                "title": "Document-wide decoding for phrase-based statistical machine translation",
                "authors": [
                    {
                        "first": "Christian",
                        "middle": [],
                        "last": "Hardmeier",
                        "suffix": ""
                    },
                    {
                        "first": "Joakim",
                        "middle": [],
                        "last": "Nivre",
                        "suffix": ""
                    },
                    {
                        "first": "J",
                        "middle": [],
                        "last": "Tiedemann",
                        "suffix": ""
                    }
                ],
                "year": 2012,
                "venue": "EMNLP-CoNLL",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Christian Hardmeier, Joakim Nivre, and J. Tiedemann. 2012. Document-wide decoding for phrase-based statistical machine translation. In EMNLP-CoNLL.",
                "links": null
            },
            "BIBREF18": {
                "ref_id": "b18",
                "title": "Achieving human parity on automatic chinese to english news translation",
                "authors": [
                    {
                        "first": "Hany",
                        "middle": [],
                        "last": "Hassan",
                        "suffix": ""
                    },
                    {
                        "first": "Anthony",
                        "middle": [],
                        "last": "Aue",
                        "suffix": ""
                    },
                    {
                        "first": "Chang",
                        "middle": [],
                        "last": "Chen",
                        "suffix": ""
                    },
                    {
                        "first": "Vishal",
                        "middle": [],
                        "last": "Chowdhary",
                        "suffix": ""
                    },
                    {
                        "first": "Jonathan",
                        "middle": [],
                        "last": "Clark",
                        "suffix": ""
                    },
                    {
                        "first": "Christian",
                        "middle": [],
                        "last": "Federmann",
                        "suffix": ""
                    },
                    {
                        "first": "Xuedong",
                        "middle": [],
                        "last": "Huang",
                        "suffix": ""
                    },
                    {
                        "first": "Marcin",
                        "middle": [],
                        "last": "Junczys-Dowmunt",
                        "suffix": ""
                    },
                    {
                        "first": "William",
                        "middle": [],
                        "last": "Lewis",
                        "suffix": ""
                    },
                    {
                        "first": "Mu",
                        "middle": [],
                        "last": "Li",
                        "suffix": ""
                    },
                    {
                        "first": "Shujie",
                        "middle": [],
                        "last": "Liu",
                        "suffix": ""
                    },
                    {
                        "first": "Tie-Yan",
                        "middle": [],
                        "last": "Liu",
                        "suffix": ""
                    },
                    {
                        "first": "Renqian",
                        "middle": [],
                        "last": "Luo",
                        "suffix": ""
                    },
                    {
                        "first": "Arul",
                        "middle": [],
                        "last": "Menezes",
                        "suffix": ""
                    },
                    {
                        "first": "Tao",
                        "middle": [],
                        "last": "Qin",
                        "suffix": ""
                    },
                    {
                        "first": "Frank",
                        "middle": [],
                        "last": "Seide",
                        "suffix": ""
                    },
                    {
                        "first": "Xu",
                        "middle": [],
                        "last": "Tan",
                        "suffix": ""
                    },
                    {
                        "first": "Fei",
                        "middle": [],
                        "last": "Tian",
                        "suffix": ""
                    },
                    {
                        "first": "Lijun",
                        "middle": [],
                        "last": "Wu",
                        "suffix": ""
                    },
                    {
                        "first": "Shuangzhi",
                        "middle": [],
                        "last": "Wu",
                        "suffix": ""
                    },
                    {
                        "first": "Yingce",
                        "middle": [],
                        "last": "Xia",
                        "suffix": ""
                    },
                    {
                        "first": "Dongdong",
                        "middle": [],
                        "last": "Zhang",
                        "suffix": ""
                    },
                    {
                        "first": "Zhirui",
                        "middle": [],
                        "last": "Zhang",
                        "suffix": ""
                    },
                    {
                        "first": "Ming",
                        "middle": [],
                        "last": "Zhou",
                        "suffix": ""
                    }
                ],
                "year": 2018,
                "venue": "",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {
                    "arXiv": [
                        "arXiv:1803.05567"
                    ]
                },
                "num": null,
                "urls": [],
                "raw_text": "Hany Hassan, Anthony Aue, Chang Chen, Vishal Chowdhary, Jonathan Clark, Christian Feder- mann, Xuedong Huang, Marcin Junczys-Dowmunt, William Lewis, Mu Li, Shujie Liu, Tie-Yan Liu, Renqian Luo, Arul Menezes, Tao Qin, Frank Seide, Xu Tan, Fei Tian, Lijun Wu, Shuangzhi Wu, Yingce Xia, Dongdong Zhang, Zhirui Zhang, and Ming Zhou. 2018. Achieving human parity on automatic chinese to english news translation. arXiv preprint arXiv:1803.05567.",
                "links": null
            },
            "BIBREF19": {
                "ref_id": "b19",
                "title": "Revisiting self-training for neural sequence generation",
                "authors": [
                    {
                        "first": "Junxian",
                        "middle": [],
                        "last": "He",
                        "suffix": ""
                    },
                    {
                        "first": "Jiatao",
                        "middle": [],
                        "last": "Gu",
                        "suffix": ""
                    },
                    {
                        "first": "Jiajun",
                        "middle": [],
                        "last": "Shen",
                        "suffix": ""
                    },
                    {
                        "first": "Marc'aurelio",
                        "middle": [],
                        "last": "Ranzato",
                        "suffix": ""
                    }
                ],
                "year": 2019,
                "venue": "",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {
                    "arXiv": [
                        "arXiv:1909.13788"
                    ]
                },
                "num": null,
                "urls": [],
                "raw_text": "Junxian He, Jiatao Gu, Jiajun Shen, and Marc'Aurelio Ranzato. 2019. Revisiting self-training for neural sequence generation. arXiv preprint arXiv:1909.13788.",
                "links": null
            },
            "BIBREF20": {
                "ref_id": "b20",
                "title": "Neural networks and physical systems with emergent collective computational abilities",
                "authors": [
                    {
                        "first": "J J",
                        "middle": [],
                        "last": "Hopfield",
                        "suffix": ""
                    }
                ],
                "year": 1982,
                "venue": "Proceedings of the National Academy of Sciences",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "J J Hopfield. 1982. Neural networks and physical sys- tems with emergent collective computational abili- ties. Proceedings of the National Academy of Sci- ences.",
                "links": null
            },
            "BIBREF21": {
                "ref_id": "b21",
                "title": "Selftraining pcfg grammars with latent annotations across languages",
                "authors": [
                    {
                        "first": "Zhongqiang",
                        "middle": [],
                        "last": "Huang",
                        "suffix": ""
                    },
                    {
                        "first": "Mary",
                        "middle": [],
                        "last": "Harper",
                        "suffix": ""
                    }
                ],
                "year": 2009,
                "venue": "EMNLP",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Zhongqiang Huang and Mary Harper. 2009. Self- training pcfg grammars with latent annotations across languages. In EMNLP.",
                "links": null
            },
            "BIBREF22": {
                "ref_id": "b22",
                "title": "Fill in the blanks: Imputing missing sentences for larger-context neural machine translation",
                "authors": [
                    {
                        "first": "Sebastien",
                        "middle": [],
                        "last": "Jean",
                        "suffix": ""
                    },
                    {
                        "first": "Ankur",
                        "middle": [],
                        "last": "Bapna",
                        "suffix": ""
                    },
                    {
                        "first": "Orhan",
                        "middle": [],
                        "last": "Firat",
                        "suffix": ""
                    }
                ],
                "year": 2019,
                "venue": "",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {
                    "arXiv": [
                        "arXiv:1910.14075"
                    ]
                },
                "num": null,
                "urls": [],
                "raw_text": "Sebastien Jean, Ankur Bapna, and Orhan Firat. 2019. Fill in the blanks: Imputing missing sentences for larger-context neural machine translation. arXiv preprint arXiv:1910.14075.",
                "links": null
            },
            "BIBREF23": {
                "ref_id": "b23",
                "title": "Does neural machine translation benefit from larger context? arXiv preprint",
                "authors": [
                    {
                        "first": "Sebastien",
                        "middle": [],
                        "last": "Jean",
                        "suffix": ""
                    },
                    {
                        "first": "Stanislas",
                        "middle": [],
                        "last": "Lauly",
                        "suffix": ""
                    },
                    {
                        "first": "Orhan",
                        "middle": [],
                        "last": "Firat",
                        "suffix": ""
                    },
                    {
                        "first": "Kyunghyun",
                        "middle": [],
                        "last": "Cho",
                        "suffix": ""
                    }
                ],
                "year": 2017,
                "venue": "",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {
                    "arXiv": [
                        "arXiv:1704.05135"
                    ]
                },
                "num": null,
                "urls": [],
                "raw_text": "Sebastien Jean, Stanislas Lauly, Orhan Firat, and Kyunghyun Cho. 2017. Does neural machine trans- lation benefit from larger context? arXiv preprint arXiv:1704.05135.",
                "links": null
            },
            "BIBREF24": {
                "ref_id": "b24",
                "title": "Microsoft translator at wmt 2019: Towards large-scale document-level neural machine translation",
                "authors": [
                    {
                        "first": "Marcin",
                        "middle": [],
                        "last": "Junczys-Dowmunt",
                        "suffix": ""
                    }
                ],
                "year": 2019,
                "venue": "WMT",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Marcin Junczys-Dowmunt. 2019. Microsoft translator at wmt 2019: Towards large-scale document-level neural machine translation. In WMT.",
                "links": null
            },
            "BIBREF25": {
                "ref_id": "b25",
                "title": "Recurrent continuous translation models",
                "authors": [
                    {
                        "first": "Nal",
                        "middle": [],
                        "last": "Kalchbrenner",
                        "suffix": ""
                    },
                    {
                        "first": "Phil",
                        "middle": [],
                        "last": "Blunsom",
                        "suffix": ""
                    }
                ],
                "year": 2013,
                "venue": "EMNLP",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Nal Kalchbrenner and Phil Blunsom. 2013. Recurrent continuous translation models. In EMNLP.",
                "links": null
            },
            "BIBREF26": {
                "ref_id": "b26",
                "title": "Adam: A method for stochastic optimization",
                "authors": [
                    {
                        "first": "P",
                        "middle": [],
                        "last": "Diederik",
                        "suffix": ""
                    },
                    {
                        "first": "Jimmy",
                        "middle": [],
                        "last": "Kingma",
                        "suffix": ""
                    },
                    {
                        "first": "",
                        "middle": [],
                        "last": "Ba",
                        "suffix": ""
                    }
                ],
                "year": 2014,
                "venue": "",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {
                    "arXiv": [
                        "arXiv:1412.6980"
                    ]
                },
                "num": null,
                "urls": [],
                "raw_text": "Diederik P Kingma and Jimmy Ba. 2014. Adam: A method for stochastic optimization. arXiv preprint arXiv:1412.6980.",
                "links": null
            },
            "BIBREF27": {
                "ref_id": "b27",
                "title": "Correlation matrix memories",
                "authors": [
                    {
                        "first": "Teuvo",
                        "middle": [],
                        "last": "Kohonen",
                        "suffix": ""
                    }
                ],
                "year": 1972,
                "venue": "IEEE Transactions on Computers",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Teuvo Kohonen. 1972. Correlation matrix memories. IEEE Transactions on Computers.",
                "links": null
            },
            "BIBREF28": {
                "ref_id": "b28",
                "title": "Dynamic evaluation of neural sequence models",
                "authors": [
                    {
                        "first": "Ben",
                        "middle": [],
                        "last": "Krause",
                        "suffix": ""
                    },
                    {
                        "first": "Emmanuel",
                        "middle": [],
                        "last": "Kahembwe",
                        "suffix": ""
                    },
                    {
                        "first": "Iain",
                        "middle": [],
                        "last": "Murray",
                        "suffix": ""
                    },
                    {
                        "first": "Steve",
                        "middle": [],
                        "last": "Renals",
                        "suffix": ""
                    }
                ],
                "year": 2018,
                "venue": "ICML",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Ben Krause, Emmanuel Kahembwe, Iain Murray, and Steve Renals. 2018. Dynamic evaluation of neural sequence models. In ICML.",
                "links": null
            },
            "BIBREF29": {
                "ref_id": "b29",
                "title": "Modeling coherence for neural machine translation with dynamic and topic caches",
                "authors": [
                    {
                        "first": "Shaohui",
                        "middle": [],
                        "last": "Kuang",
                        "suffix": ""
                    },
                    {
                        "first": "Deyi",
                        "middle": [],
                        "last": "Xiong",
                        "suffix": ""
                    },
                    {
                        "first": "Weihua",
                        "middle": [],
                        "last": "Luo",
                        "suffix": ""
                    },
                    {
                        "first": "Guodong",
                        "middle": [],
                        "last": "Zhou",
                        "suffix": ""
                    }
                ],
                "year": 2017,
                "venue": "",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {
                    "arXiv": [
                        "arXiv:1711.11221"
                    ]
                },
                "num": null,
                "urls": [],
                "raw_text": "Shaohui Kuang, Deyi Xiong, Weihua Luo, and Guodong Zhou. 2017. Modeling coherence for neural machine translation with dynamic and topic caches. arXiv preprint arXiv:1711.11221.",
                "links": null
            },
            "BIBREF30": {
                "ref_id": "b30",
                "title": "A cachebased natural language model for speech recognition",
                "authors": [
                    {
                        "first": "Roland",
                        "middle": [],
                        "last": "Kuhn",
                        "suffix": ""
                    },
                    {
                        "first": "Renato",
                        "middle": [
                            "De"
                        ],
                        "last": "Mori",
                        "suffix": ""
                    }
                ],
                "year": 1990,
                "venue": "PAMI",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Roland Kuhn and Renato De Mori. 1990. A cache- based natural language model for speech recogni- tion. In PAMI.",
                "links": null
            },
            "BIBREF31": {
                "ref_id": "b31",
                "title": "Pseudo-label : The simple and efficient semi-supervised learning method for deep neural networks",
                "authors": [
                    {
                        "first": "Dong-Hyun",
                        "middle": [],
                        "last": "Lee",
                        "suffix": ""
                    }
                ],
                "year": 2013,
                "venue": "ICML 2013 Workshop : Challenges in Representation Learning (WREPL)",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Dong-Hyun Lee. 2013. Pseudo-label : The simple and efficient semi-supervised learning method for deep neural networks. ICML 2013 Workshop : Chal- lenges in Representation Learning (WREPL).",
                "links": null
            },
            "BIBREF32": {
                "ref_id": "b32",
                "title": "Document context neural machine translation with memory networks",
                "authors": [
                    {
                        "first": "Sameen",
                        "middle": [],
                        "last": "Maruf",
                        "suffix": ""
                    },
                    {
                        "first": "Gholamreza",
                        "middle": [],
                        "last": "Haffari",
                        "suffix": ""
                    }
                ],
                "year": 2018,
                "venue": "ACL",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Sameen Maruf and Gholamreza Haffari. 2018. Docu- ment context neural machine translation with mem- ory networks. In ACL.",
                "links": null
            },
            "BIBREF33": {
                "ref_id": "b33",
                "title": "Effective self-training for parsing",
                "authors": [
                    {
                        "first": "David",
                        "middle": [],
                        "last": "Mcclosky",
                        "suffix": ""
                    },
                    {
                        "first": "Eugene",
                        "middle": [],
                        "last": "Charniak",
                        "suffix": ""
                    },
                    {
                        "first": "Mark",
                        "middle": [],
                        "last": "Johnson",
                        "suffix": ""
                    }
                ],
                "year": 2006,
                "venue": "ACL",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "David McClosky, Eugene Charniak, and Mark Johnson. 2006. Effective self-training for parsing. In ACL.",
                "links": null
            },
            "BIBREF34": {
                "ref_id": "b34",
                "title": "Document-level neural machine translation with hierarchical attention networks",
                "authors": [
                    {
                        "first": "Lesly",
                        "middle": [],
                        "last": "Miculicich",
                        "suffix": ""
                    },
                    {
                        "first": "Dhananjay",
                        "middle": [],
                        "last": "Ram",
                        "suffix": ""
                    },
                    {
                        "first": "Nikolaos",
                        "middle": [],
                        "last": "Pappas",
                        "suffix": ""
                    },
                    {
                        "first": "James",
                        "middle": [],
                        "last": "Henderson",
                        "suffix": ""
                    }
                ],
                "year": 2018,
                "venue": "EMNLP",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Lesly Miculicich, Dhananjay Ram, Nikolaos Pappas, and James Henderson. 2018. Document-level neural machine translation with hierarchical attention net- works. In EMNLP.",
                "links": null
            },
            "BIBREF35": {
                "ref_id": "b35",
                "title": "Statistical language models based on neural networks",
                "authors": [
                    {
                        "first": "Tomas",
                        "middle": [],
                        "last": "Mikolov",
                        "suffix": ""
                    }
                ],
                "year": 2012,
                "venue": "",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Tomas Mikolov. 2012. Statistical language models based on neural networks. Ph.D. thesis, Brno Uni- versity of Technology.",
                "links": null
            },
            "BIBREF36": {
                "ref_id": "b36",
                "title": "Proceedings of the Fourth Workshop on Discourse in Machine Translation",
                "authors": [
                    {
                        "first": "Andrei",
                        "middle": [],
                        "last": "Popescu-Belis",
                        "suffix": ""
                    },
                    {
                        "first": "Sharid",
                        "middle": [],
                        "last": "Lo\u00e1iciga",
                        "suffix": ""
                    },
                    {
                        "first": "Christian",
                        "middle": [],
                        "last": "Hardmeier",
                        "suffix": ""
                    },
                    {
                        "first": "Deyi",
                        "middle": [],
                        "last": "Xiong",
                        "suffix": ""
                    }
                ],
                "year": 2019,
                "venue": "",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Andrei Popescu-Belis, Sharid Lo\u00e1iciga, Christian Hardmeier, and Deyi Xiong. 2019. Proceedings of the Fourth Workshop on Discourse in Machine Translation (DiscoMT 2019). https://www. aclweb.org/anthology/D19-65.pdf.",
                "links": null
            },
            "BIBREF37": {
                "ref_id": "b37",
                "title": "A call for clarity in reporting BLEU scores",
                "authors": [
                    {
                        "first": "Matt",
                        "middle": [],
                        "last": "Post",
                        "suffix": ""
                    }
                ],
                "year": 2018,
                "venue": "WMT",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Matt Post. 2018. A call for clarity in reporting BLEU scores. In WMT.",
                "links": null
            },
            "BIBREF38": {
                "ref_id": "b38",
                "title": "Language models are unsupervised multitask learners",
                "authors": [
                    {
                        "first": "A",
                        "middle": [],
                        "last": "Radford",
                        "suffix": ""
                    },
                    {
                        "first": "Jeffrey",
                        "middle": [],
                        "last": "Wu",
                        "suffix": ""
                    },
                    {
                        "first": "R",
                        "middle": [],
                        "last": "Child",
                        "suffix": ""
                    },
                    {
                        "first": "David",
                        "middle": [],
                        "last": "Luan",
                        "suffix": ""
                    },
                    {
                        "first": "Dario",
                        "middle": [],
                        "last": "Amodei",
                        "suffix": ""
                    },
                    {
                        "first": "Ilya",
                        "middle": [],
                        "last": "Sutskever",
                        "suffix": ""
                    }
                ],
                "year": 2019,
                "venue": "",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "A. Radford, Jeffrey Wu, R. Child, David Luan, Dario Amodei, and Ilya Sutskever. 2019. Language mod- els are unsupervised multitask learners.",
                "links": null
            },
            "BIBREF39": {
                "ref_id": "b39",
                "title": "Self-training for enhancement and domain adaptation of statistical parsers trained on small datasets",
                "authors": [
                    {
                        "first": "Roi",
                        "middle": [],
                        "last": "Reichart",
                        "suffix": ""
                    },
                    {
                        "first": "Rai",
                        "middle": [],
                        "last": "Rappoport",
                        "suffix": ""
                    }
                ],
                "year": 2007,
                "venue": "ACL",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Roi Reichart and Rai Rappoport. 2007. Self-training for enhancement and domain adaptation of statistical parsers trained on small datasets. In ACL.",
                "links": null
            },
            "BIBREF40": {
                "ref_id": "b40",
                "title": "Probability of error of some adaptive pattern-recognition machines",
                "authors": [
                    {
                        "first": "H",
                        "middle": [],
                        "last": "Scudder",
                        "suffix": ""
                    }
                ],
                "year": 1965,
                "venue": "IEEE Trans. Inf. Theor",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "H. Scudder. 1965. Probability of error of some adap- tive pattern-recognition machines. IEEE Trans. Inf. Theor.",
                "links": null
            },
            "BIBREF41": {
                "ref_id": "b41",
                "title": "Why the Time Is Ripe for Discourse in Machine Translation",
                "authors": [
                    {
                        "first": "Rico",
                        "middle": [],
                        "last": "Sennrich",
                        "suffix": ""
                    }
                ],
                "year": 2018,
                "venue": "",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Rico Sennrich. 2018. Why the Time Is Ripe for Discourse in Machine Translation. http://homepages.inf.ed.ac.uk/ rsennric/wnmt2018.pdf.",
                "links": null
            },
            "BIBREF42": {
                "ref_id": "b42",
                "title": "Improving neural machine translation models with monolingual data",
                "authors": [
                    {
                        "first": "Rico",
                        "middle": [],
                        "last": "Sennrich",
                        "suffix": ""
                    },
                    {
                        "first": "Barry",
                        "middle": [],
                        "last": "Haddow",
                        "suffix": ""
                    },
                    {
                        "first": "Alexandra",
                        "middle": [],
                        "last": "Birch",
                        "suffix": ""
                    }
                ],
                "year": 2016,
                "venue": "ACL",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Rico Sennrich, Barry Haddow, and Alexandra Birch. 2016a. Improving neural machine translation mod- els with monolingual data. In ACL.",
                "links": null
            },
            "BIBREF43": {
                "ref_id": "b43",
                "title": "Neural machine translation of rare words with subword units",
                "authors": [
                    {
                        "first": "Rico",
                        "middle": [],
                        "last": "Sennrich",
                        "suffix": ""
                    },
                    {
                        "first": "Barry",
                        "middle": [],
                        "last": "Haddow",
                        "suffix": ""
                    },
                    {
                        "first": "Alexandra",
                        "middle": [],
                        "last": "Birch",
                        "suffix": ""
                    }
                ],
                "year": 2016,
                "venue": "ACL",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Rico Sennrich, Barry Haddow, and Alexandra Birch. 2016b. Neural machine translation of rare words with subword units. In ACL.",
                "links": null
            },
            "BIBREF44": {
                "ref_id": "b44",
                "title": "A mathematical theory of communication",
                "authors": [
                    {
                        "first": "Claude",
                        "middle": [
                            "E"
                        ],
                        "last": "Shannon",
                        "suffix": ""
                    }
                ],
                "year": 1948,
                "venue": "Bell Syst. Tech. J",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Claude E. Shannon. 1948. A mathematical theory of communication. Bell Syst. Tech. J.",
                "links": null
            },
            "BIBREF45": {
                "ref_id": "b45",
                "title": "Dropout: A simple way to prevent neural networks from overfitting",
                "authors": [
                    {
                        "first": "Nitish",
                        "middle": [],
                        "last": "Srivastava",
                        "suffix": ""
                    },
                    {
                        "first": "Geoffrey",
                        "middle": [],
                        "last": "Hinton",
                        "suffix": ""
                    },
                    {
                        "first": "Alex",
                        "middle": [],
                        "last": "Krizhevsky",
                        "suffix": ""
                    },
                    {
                        "first": "Ilya",
                        "middle": [],
                        "last": "Sutskever",
                        "suffix": ""
                    },
                    {
                        "first": "Ruslan",
                        "middle": [],
                        "last": "Salakhutdinov",
                        "suffix": ""
                    }
                ],
                "year": 2014,
                "venue": "",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Nitish Srivastava, Geoffrey Hinton, Alex Krizhevsky, Ilya Sutskever, and Ruslan Salakhutdinov. 2014. Dropout: A simple way to prevent neural networks from overfitting.",
                "links": null
            },
            "BIBREF46": {
                "ref_id": "b46",
                "title": "Sequence to sequence learning with neural networks",
                "authors": [
                    {
                        "first": "Ilya",
                        "middle": [],
                        "last": "Sutskever",
                        "suffix": ""
                    },
                    {
                        "first": "Oriol",
                        "middle": [],
                        "last": "Vinyals",
                        "suffix": ""
                    },
                    {
                        "first": "Quoc V",
                        "middle": [],
                        "last": "Le",
                        "suffix": ""
                    }
                ],
                "year": 2014,
                "venue": "",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Ilya Sutskever, Oriol Vinyals, and Quoc V Le. 2014. Sequence to sequence learning with neural networks. In NIPS.",
                "links": null
            },
            "BIBREF47": {
                "ref_id": "b47",
                "title": "Neural machine translation with extended context",
                "authors": [
                    {
                        "first": "J\u00f6rg",
                        "middle": [],
                        "last": "Tiedemann",
                        "suffix": ""
                    },
                    {
                        "first": "Yves",
                        "middle": [],
                        "last": "Scherrer",
                        "suffix": ""
                    }
                ],
                "year": 2017,
                "venue": "Proceedings of the Third Workshop on Discourse in Machine Translation",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "J\u00f6rg Tiedemann and Yves Scherrer. 2017. Neural ma- chine translation with extended context. In Proceed- ings of the Third Workshop on Discourse in Machine Translation.",
                "links": null
            },
            "BIBREF48": {
                "ref_id": "b48",
                "title": "Using monolingual sourcelanguage data to improve mt performance",
                "authors": [
                    {
                        "first": "Nicola",
                        "middle": [],
                        "last": "Ueffing",
                        "suffix": ""
                    }
                ],
                "year": 2006,
                "venue": "IWSLT",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Nicola Ueffing. 2006. Using monolingual source- language data to improve mt performance. In IWSLT.",
                "links": null
            },
            "BIBREF50": {
                "ref_id": "b50",
                "title": "Attention is all you need",
                "authors": [
                    {
                        "first": "Ashish",
                        "middle": [],
                        "last": "Vaswani",
                        "suffix": ""
                    },
                    {
                        "first": "Noam",
                        "middle": [],
                        "last": "Shazeer",
                        "suffix": ""
                    },
                    {
                        "first": "Niki",
                        "middle": [],
                        "last": "Parmar",
                        "suffix": ""
                    },
                    {
                        "first": "Jakob",
                        "middle": [],
                        "last": "Uszkoreit",
                        "suffix": ""
                    },
                    {
                        "first": "Llion",
                        "middle": [],
                        "last": "Jones",
                        "suffix": ""
                    },
                    {
                        "first": "Aidan",
                        "middle": [
                            "N"
                        ],
                        "last": "Gomez",
                        "suffix": ""
                    },
                    {
                        "first": "\u0141ukasz",
                        "middle": [],
                        "last": "Kaiser",
                        "suffix": ""
                    },
                    {
                        "first": "Illia",
                        "middle": [],
                        "last": "Polosukhin",
                        "suffix": ""
                    }
                ],
                "year": 2017,
                "venue": "NIPS",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Ashish Vaswani, Noam Shazeer, Niki Parmar, Jakob Uszkoreit, Llion Jones, Aidan N Gomez, \u0141ukasz Kaiser, and Illia Polosukhin. 2017. Attention is all you need. In NIPS.",
                "links": null
            },
            "BIBREF51": {
                "ref_id": "b51",
                "title": "Context-aware monolingual repair for neural machine translation",
                "authors": [
                    {
                        "first": "Elena",
                        "middle": [],
                        "last": "Voita",
                        "suffix": ""
                    },
                    {
                        "first": "Rico",
                        "middle": [],
                        "last": "Sennrich",
                        "suffix": ""
                    },
                    {
                        "first": "Ivan",
                        "middle": [],
                        "last": "Titov",
                        "suffix": ""
                    }
                ],
                "year": 2019,
                "venue": "EMNLP",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Elena Voita, Rico Sennrich, and Ivan Titov. 2019a. Context-aware monolingual repair for neural ma- chine translation. In EMNLP.",
                "links": null
            },
            "BIBREF52": {
                "ref_id": "b52",
                "title": "When a good translation is wrong in context: Context-aware machine translation improves on deixis, ellipsis, and lexical cohesion",
                "authors": [
                    {
                        "first": "Elena",
                        "middle": [],
                        "last": "Voita",
                        "suffix": ""
                    },
                    {
                        "first": "Rico",
                        "middle": [],
                        "last": "Sennrich",
                        "suffix": ""
                    },
                    {
                        "first": "Ivan",
                        "middle": [],
                        "last": "Titov",
                        "suffix": ""
                    }
                ],
                "year": 2019,
                "venue": "ACL",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Elena Voita, Rico Sennrich, and Ivan Titov. 2019b. When a good translation is wrong in context: Context-aware machine translation improves on deixis, ellipsis, and lexical cohesion. In ACL.",
                "links": null
            },
            "BIBREF53": {
                "ref_id": "b53",
                "title": "Exploiting cross-sentence context for neural machine translation",
                "authors": [
                    {
                        "first": "Longyue",
                        "middle": [],
                        "last": "Wang",
                        "suffix": ""
                    },
                    {
                        "first": "Zhaopeng",
                        "middle": [],
                        "last": "Tu",
                        "suffix": ""
                    },
                    {
                        "first": "Andy",
                        "middle": [],
                        "last": "Way",
                        "suffix": ""
                    },
                    {
                        "first": "Qun",
                        "middle": [],
                        "last": "Liu",
                        "suffix": ""
                    }
                ],
                "year": 2017,
                "venue": "EMNLP",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Longyue Wang, Zhaopeng Tu, Andy Way, and Qun Liu. 2017. Exploiting cross-sentence context for neural machine translation. In EMNLP.",
                "links": null
            },
            "BIBREF54": {
                "ref_id": "b54",
                "title": "Nonholographic associative memory",
                "authors": [
                    {
                        "first": "J",
                        "middle": [],
                        "last": "David",
                        "suffix": ""
                    },
                    {
                        "first": "",
                        "middle": [],
                        "last": "Willshaw",
                        "suffix": ""
                    },
                    {
                        "first": "Hugh",
                        "middle": [
                            "Christopher"
                        ],
                        "last": "Peter Buneman",
                        "suffix": ""
                    },
                    {
                        "first": "",
                        "middle": [],
                        "last": "Longuet-Higgins",
                        "suffix": ""
                    }
                ],
                "year": 1969,
                "venue": "Nature",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "David J Willshaw, O Peter Buneman, and Hugh Christopher Longuet-Higgins. 1969. Non- holographic associative memory. Nature.",
                "links": null
            },
            "BIBREF55": {
                "ref_id": "b55",
                "title": "Microsoft research asia's systems for WMT19",
                "authors": [
                    {
                        "first": "Yingce",
                        "middle": [],
                        "last": "Xia",
                        "suffix": ""
                    },
                    {
                        "first": "Xu",
                        "middle": [],
                        "last": "Tan",
                        "suffix": ""
                    },
                    {
                        "first": "Fei",
                        "middle": [],
                        "last": "Tian",
                        "suffix": ""
                    },
                    {
                        "first": "Fei",
                        "middle": [],
                        "last": "Gao",
                        "suffix": ""
                    },
                    {
                        "first": "Di",
                        "middle": [],
                        "last": "He",
                        "suffix": ""
                    },
                    {
                        "first": "Weicong",
                        "middle": [],
                        "last": "Chen",
                        "suffix": ""
                    },
                    {
                        "first": "Yang",
                        "middle": [],
                        "last": "Fan",
                        "suffix": ""
                    },
                    {
                        "first": "Linyuan",
                        "middle": [],
                        "last": "Gong",
                        "suffix": ""
                    },
                    {
                        "first": "Yichong",
                        "middle": [],
                        "last": "Leng",
                        "suffix": ""
                    },
                    {
                        "first": "Renqian",
                        "middle": [],
                        "last": "Luo",
                        "suffix": ""
                    },
                    {
                        "first": "Yiren",
                        "middle": [],
                        "last": "Wang",
                        "suffix": ""
                    },
                    {
                        "first": "Lijun",
                        "middle": [],
                        "last": "Wu",
                        "suffix": ""
                    },
                    {
                        "first": "Jinhua",
                        "middle": [],
                        "last": "Zhu",
                        "suffix": ""
                    },
                    {
                        "first": "Tao",
                        "middle": [],
                        "last": "Qin",
                        "suffix": ""
                    },
                    {
                        "first": "Tie-Yan",
                        "middle": [],
                        "last": "Liu",
                        "suffix": ""
                    }
                ],
                "year": 2019,
                "venue": "WMT",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Yingce Xia, Xu Tan, Fei Tian, Fei Gao, Di He, Weicong Chen, Yang Fan, Linyuan Gong, Yichong Leng, Ren- qian Luo, Yiren Wang, Lijun Wu, Jinhua Zhu, Tao Qin, and Tie-Yan Liu. 2019. Microsoft research asia's systems for WMT19. In WMT.",
                "links": null
            },
            "BIBREF56": {
                "ref_id": "b56",
                "title": "Deliberation networks: Sequence generation beyond one-pass decoding",
                "authors": [
                    {
                        "first": "Yingce",
                        "middle": [],
                        "last": "Xia",
                        "suffix": ""
                    },
                    {
                        "first": "Fei",
                        "middle": [],
                        "last": "Tian",
                        "suffix": ""
                    },
                    {
                        "first": "Lijun",
                        "middle": [],
                        "last": "Wu",
                        "suffix": ""
                    },
                    {
                        "first": "Jianxin",
                        "middle": [],
                        "last": "Lin",
                        "suffix": ""
                    },
                    {
                        "first": "Tao",
                        "middle": [],
                        "last": "Qin",
                        "suffix": ""
                    },
                    {
                        "first": "Nenghai",
                        "middle": [],
                        "last": "Yu",
                        "suffix": ""
                    },
                    {
                        "first": "Tie-Yan",
                        "middle": [],
                        "last": "Liu",
                        "suffix": ""
                    }
                ],
                "year": 2017,
                "venue": "NIPS",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Yingce Xia, Fei Tian, Lijun Wu, Jianxin Lin, Tao Qin, Nenghai Yu, and Tie-Yan Liu. 2017. Deliberation networks: Sequence generation beyond one-pass de- coding. In NIPS.",
                "links": null
            },
            "BIBREF57": {
                "ref_id": "b57",
                "title": "Modeling coherence for discourse neural machine translation",
                "authors": [
                    {
                        "first": "Hao",
                        "middle": [],
                        "last": "Xiong",
                        "suffix": ""
                    },
                    {
                        "first": "Zhongjun",
                        "middle": [],
                        "last": "He",
                        "suffix": ""
                    },
                    {
                        "first": "Hua",
                        "middle": [],
                        "last": "Wu",
                        "suffix": ""
                    },
                    {
                        "first": "Haifeng",
                        "middle": [],
                        "last": "Wang",
                        "suffix": ""
                    }
                ],
                "year": 2018,
                "venue": "",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {
                    "arXiv": [
                        "arXiv:1811.05683"
                    ]
                },
                "num": null,
                "urls": [],
                "raw_text": "Hao Xiong, Zhongjun He, Hua Wu, and Haifeng Wang. 2018. Modeling coherence for discourse neural ma- chine translation. arXiv preprint arXiv:1811.05683.",
                "links": null
            },
            "BIBREF58": {
                "ref_id": "b58",
                "title": "Unsupervised word sense disambiguation rivaling supervised methods",
                "authors": [
                    {
                        "first": "David",
                        "middle": [],
                        "last": "Yarowsky",
                        "suffix": ""
                    }
                ],
                "year": 1995,
                "venue": "ACL",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "David Yarowsky. 1995. Unsupervised word sense dis- ambiguation rivaling supervised methods. In ACL.",
                "links": null
            },
            "BIBREF59": {
                "ref_id": "b59",
                "title": "Simple and effective noisy channel modeling for neural machine translation",
                "authors": [
                    {
                        "first": "Kyra",
                        "middle": [],
                        "last": "Yee",
                        "suffix": ""
                    },
                    {
                        "first": "Nathan",
                        "middle": [],
                        "last": "Ng",
                        "suffix": ""
                    },
                    {
                        "first": "Yann",
                        "middle": [
                            "N"
                        ],
                        "last": "Dauphin",
                        "suffix": ""
                    },
                    {
                        "first": "Michael",
                        "middle": [],
                        "last": "Auli",
                        "suffix": ""
                    }
                ],
                "year": 2019,
                "venue": "EMNLP",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Kyra Yee, Nathan Ng, Yann N. Dauphin, and Michael Auli. 2019. Simple and effective noisy channel mod- eling for neural machine translation. In EMNLP.",
                "links": null
            },
            "BIBREF60": {
                "ref_id": "b60",
                "title": "Better document-level machine translation with bayes' rule",
                "authors": [
                    {
                        "first": "L",
                        "middle": [],
                        "last": "Yu",
                        "suffix": ""
                    },
                    {
                        "first": "Laurent",
                        "middle": [],
                        "last": "Sartran",
                        "suffix": ""
                    },
                    {
                        "first": "Wojciech",
                        "middle": [],
                        "last": "Stokowiec",
                        "suffix": ""
                    },
                    {
                        "first": "Wang",
                        "middle": [],
                        "last": "Ling",
                        "suffix": ""
                    },
                    {
                        "first": "Lingpeng",
                        "middle": [],
                        "last": "Kong",
                        "suffix": ""
                    },
                    {
                        "first": "P",
                        "middle": [],
                        "last": "Blunsom",
                        "suffix": ""
                    },
                    {
                        "first": "Chris",
                        "middle": [],
                        "last": "Dyer",
                        "suffix": ""
                    }
                ],
                "year": 2019,
                "venue": "Transactions of the Association for Computational Linguistics",
                "volume": "8",
                "issue": "",
                "pages": "346--360",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "L. Yu, Laurent Sartran, Wojciech Stokowiec, Wang Ling, Lingpeng Kong, P. Blunsom, and Chris Dyer. 2019. Better document-level machine translation with bayes' rule. Transactions of the Association for Computational Linguistics, 8:346-360.",
                "links": null
            },
            "BIBREF61": {
                "ref_id": "b61",
                "title": "The neural noisy channel",
                "authors": [
                    {
                        "first": "Lei",
                        "middle": [],
                        "last": "Yu",
                        "suffix": ""
                    },
                    {
                        "first": "Phil",
                        "middle": [],
                        "last": "Blunsom",
                        "suffix": ""
                    },
                    {
                        "first": "Chris",
                        "middle": [],
                        "last": "Dyer",
                        "suffix": ""
                    },
                    {
                        "first": "Edward",
                        "middle": [],
                        "last": "Grefenstette",
                        "suffix": ""
                    },
                    {
                        "first": "Tomas",
                        "middle": [],
                        "last": "Kocisky",
                        "suffix": ""
                    }
                ],
                "year": 2017,
                "venue": "ICLR",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Lei Yu, Phil Blunsom, Chris Dyer, Edward Grefen- stette, and Tomas Kocisky. 2017. The neural noisy channel. In ICLR.",
                "links": null
            },
            "BIBREF62": {
                "ref_id": "b62",
                "title": "Improving the transformer translation model with document-level context",
                "authors": [
                    {
                        "first": "Jiacheng",
                        "middle": [],
                        "last": "Zhang",
                        "suffix": ""
                    },
                    {
                        "first": "Huanbo",
                        "middle": [],
                        "last": "Luan",
                        "suffix": ""
                    },
                    {
                        "first": "Maosong",
                        "middle": [],
                        "last": "Sun",
                        "suffix": ""
                    },
                    {
                        "first": "Feifei",
                        "middle": [],
                        "last": "Zhai",
                        "suffix": ""
                    },
                    {
                        "first": "Jingfang",
                        "middle": [],
                        "last": "Xu",
                        "suffix": ""
                    },
                    {
                        "first": "Min",
                        "middle": [],
                        "last": "Zhang",
                        "suffix": ""
                    },
                    {
                        "first": "Yang",
                        "middle": [],
                        "last": "Liu",
                        "suffix": ""
                    }
                ],
                "year": 2018,
                "venue": "EMNLP",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Jiacheng Zhang, Huanbo Luan, Maosong Sun, Feifei Zhai, Jingfang Xu, Min Zhang, and Yang Liu. 2018. Improving the transformer translation model with document-level context. In EMNLP.",
                "links": null
            },
            "BIBREF63": {
                "ref_id": "b63",
                "title": "Exploiting source-side monolingual data in neural machine translation",
                "authors": [
                    {
                        "first": "Jiajun",
                        "middle": [],
                        "last": "Zhang",
                        "suffix": ""
                    },
                    {
                        "first": "Chengqing",
                        "middle": [],
                        "last": "Zong",
                        "suffix": ""
                    }
                ],
                "year": 2016,
                "venue": "EMNLP",
                "volume": "",
                "issue": "",
                "pages": "",
                "other_ids": {},
                "num": null,
                "urls": [],
                "raw_text": "Jiajun Zhang and Chengqing Zong. 2016. Exploit- ing source-side monolingual data in neural machine translation. In EMNLP.",
                "links": null
            }
        },
        "ref_entries": {
            "FIGREF1": {
                "num": null,
                "uris": null,
                "type_str": "figure",
                "text": "Relationship between relative performance of the sentence-level model and BLEU difference of self-training on the NIST dataset."
            },
            "FIGREF2": {
                "num": null,
                "uris": null,
                "type_str": "figure",
                "text": "Relationship between number of sentences and BLEU improvement of self-training on the NIST dataset."
            },
            "TABREF3": {
                "num": null,
                "html": null,
                "text": "Results on WMT'19 Chinese-English evaluation sets. The first row shows the performance of the Transformer Big model by",
                "content": "<table/>",
                "type_str": "table"
            },
            "TABREF5": {
                "num": null,
                "html": null,
                "text": "",
                "content": "<table/>",
                "type_str": "table"
            },
            "TABREF6": {
                "num": null,
                "html": null,
                "text": "Ref \u043c\u044b \u0441 \u044d\u0439\u043f\u0440\u0438\u043b \u0440\u0430\u0437\u0432\u0435\u043b\u0438\u0441\u044c . \u043a\u0430\u043a \u044f \u0438 \u0441\u043a\u0430\u0437\u0430\u043b ... \u0438\u0433\u0440\u0430 \u0432 \u043e\u0436\u0438\u0434\u0430\u043d\u0438\u0435 . \u0431\u0443\u0434\u044c \u0441\u0438\u043b\u044c\u043d\u044b\u043c . \u0438 \u0432\u0441\u0451 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u0441\u044f . Baseline \u043c\u044b \u0441 \u044d\u0439\u043f\u0440\u0438\u043b \u0440\u0430\u0437\u0432\u0435\u043b\u0438\u0441\u044c . \u043d\u0443 , \u043a\u0430\u043a \u044f \u0443\u0436\u0435 \u0441\u043a\u0430\u0437\u0430\u043b ... \u0438\u0433\u0440\u0430 \u043e\u0436\u0438\u0434\u0430\u043d\u0438\u044f . \u0431\u0443\u0434\u044c \u0441\u0438\u043b\u044c\u043d\u043e\u0439 . \u0442\u044b \u0441\u043f\u0440\u0430\u0432\u0438\u0448\u044c\u0441\u044f . Ours \u043c\u044b \u0441 \u044d\u0439\u043f\u0440\u0438\u043b \u0440\u0430\u0437\u0432\u0435\u043b\u0438\u0441\u044c . \u043d\u0443 , \u043a\u0430\u043a \u044f \u0443\u0436\u0435 \u0441\u043a\u0430\u0437\u0430\u043b ... \u0438\u0433\u0440\u0430 \u043e\u0436\u0438\u0434\u0430\u043d\u0438\u044f . \u0431\u0443\u0434\u044c \u0441\u0438\u043b\u044c\u043d\u044b\u043c . \u0442\u044b \u0441\u043f\u0440\u0430\u0432\u0438\u0448\u044c\u0441\u044f . Ref \u0441\u0451\u0440\u0435\u043d \u0443\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u0442 \u0432\u0435\u0447\u0435\u0440\u0438\u043d\u043a\u0443 \u043f\u043e \u043f\u043e\u0432\u043e\u0434\u0443 \u0441\u0432\u043e\u0435\u0433\u043e \u0434\u043d\u044f \u0440\u043e\u0436\u0434\u0435\u043d\u0438\u044f \u0432 \u0441\u0443\u0431\u0431\u043e\u0442\u0443 , \u0430 \u044f \u043d\u0435 \u0437\u043d\u0430\u044e , \u043f\u043e\u0439\u0434\u0443 \u043b\u0438 \u044f . \u043f\u043e\u0447\u0435\u043c\u0443 \u0431\u044b \u0442\u0435\u0431\u0435 \u043d\u0435 \u043f\u043e\u0439\u0442\u0438 ? \u043f\u0440\u043e\u0441\u0442\u043e \u0432\u0441\u0451 \u043f\u043e\u0448\u043b\u043e \u043d\u0435 \u0442\u0430\u043a . -\u0438 \u044f \u043f\u043e\u0441\u0441\u043e\u0440\u0438\u043b\u0441\u044f \u0441 \u043a\u043d\u0443\u0434\u043e\u043c . Baseline \u0432 \u0441\u0443\u0431\u0431\u043e\u0442\u0443 \u0434\u0435\u043d\u044c \u0440\u043e\u0436\u0434\u0435\u043d\u0438\u044f \u0441\u0451\u0440\u0435\u043d\u0430 \u0438 \u044f \u043d\u0435 \u0437\u043d\u0430\u044e , \u043f\u0440\u0438\u0433\u043b\u0430\u0448\u0435\u043d\u0430 \u043b\u0438 \u044f . \u043f\u043e\u0447\u0435\u043c\u0443 \u0442\u0435\u0431\u044f \u043d\u0435 \u043f\u0440\u0438\u0433\u043b\u0430\u0441\u0438\u043b\u0438 ? \u0432\u0441\u0435 \u043f\u0440\u043e\u0441\u0442\u043e \u043f\u043e\u0448\u043b\u043e \u043d\u0435 \u0442\u0430\u043a . -\u0438 \u044f \u043f\u043e\u0440\u0443\u0433\u0430\u043b\u0441\u044f \u0441 \u043a\u043d\u0443\u0434\u043e\u043c .",
                "content": "<table><tr><td>Ours</td><td>\u0432 \u0441\u0443\u0431\u0431\u043e\u0442\u0443 \u0434\u0435\u043d\u044c \u0440\u043e\u0436\u0434\u0435\u043d\u0438\u044f \u0441\u0451\u0440\u0435\u043d\u0430 \u0438 \u044f \u043d\u0435 \u0437\u043d\u0430\u044e , \u043f\u0440\u0438\u0433\u043b\u0430\u0448\u0435\u043d\u0430 \u043b\u0438 \u044f .</td></tr><tr><td/><td>\u043f\u043e\u0447\u0435\u043c\u0443 \u0442\u0435\u0431\u044f \u043d\u0435 \u043f\u0440\u0438\u0433\u043b\u0430\u0441\u0438\u043b\u0438 ? \u0432\u0441\u0435 \u043f\u0440\u043e\u0441\u0442\u043e \u043f\u043e\u0448\u043b\u043e \u043d\u0435 \u0442\u0430\u043a . -\u0438 \u044f \u043f\u043e\u0441\u0441\u043e\u0440\u0438\u043b\u0430\u0441\u044c \u0441 \u043a\u043d\u0443\u0434\u043e\u043c .</td></tr></table>",
                "type_str": "table"
            }
        }
    }
}